If the AI data-center used only 10MW then each could have two redundant SMR's assuming the cooling challenges have been worked out but then we could have nuclear reactor disposal and collision issues.
Put those three together and maybe it’s possible to push physics to its limits. Faster networking, maybe 4x-5x capacity per unit compared to earth. Servicing is a pain, might be cheaper to just replace the hardware when a node goes bad.
But it mainly makes sense to those who have the capability and can do it cheaply (compared to the rest). There’s only one company that I can think of and that is SpaceX. They are closing in on (or passed) 8,000 satellites. Vertical integration means their cost-base will always be less than any competitor.
To that end, a small data center space isn’t about unit-economics, it’s a bigger mission. So the question we should consider is what can we put into space the further that mission. Can we put a meaningful sum of human knowledge out there for preservation? It sounds like “yes,” even if we can’t train ChatGPT models out there yet.
This is false, it's hard to cool things in space. Space (vacuum) is a very good insulator.
3 are ways to cool things (lose energy):
- Conduction
- Convection
- Radiation
How about now? https://www.bbc.com/news/articles/ce3ex92557jo
The whole time I was there it was a mental game of trying to steel man the contradictory or incoherent stuff, using my brain power to try and rewrite things to make sense.
After some years, I woke up and realized that’s what I was doing, and even if I could do it in my mind, that didn’t make the source material rational.
Heres hoping you have a similar moment.
Do you know the cost of sending up a payload of them?
Do you know how much $$ you need to extract from those payloads to make the cost of sending them up make sense?
Do you know how much they've lied about Starlink revenue and subscription counts?
(Yes, I know what steel manning is)
- Data centres need a lot of power = giant vast solar panels
- Data centres need a lot of cooling. That's some almighty heatsinks you're going need
- They will need to be radiation-hardened to avoid memory corruption = even more mass
- The hardware will be redundant in like 2 years tops and will need replacing to stay competitive
- Data centres are about 100x bigger (not including solar panels and heat sinks) than the biggest thing we've ever put in space
Tesla is losing market share (and rank increasingly poorly against alternatives), his robots are gonna fail, this datacentre ambition needs to break the laws of physics, grok/twitter is a fake news pedo-loving cesspit that's gonna be regulated into oblivion. Its only down from here on out.
Then they work backwards, trying to figure out some economic engine to make it happen. "Data centers" are (A) in-vogue for investment right now and (B) vaguely plausible, at least compared to having a space-casino.
I do not politically align with Musk. I’ve always thought Tesla was important in popularizing electric cars while being a low-quality built product with repair and supply chain issues. I think The Boring Company is a joke. Twitter was a power-grab.
I also think SpaceX is societally beneficial, a good means to shake-up a stagnant industry and a humanity-wide area of interest.
If you think I’m a member of a religious cult, I respectfully suggest you evaluate what led You to believe that itself.
Disagree there are bunch of scenarios where Data Centers in space make sense. Like nuclear annihilation and having vaults across the globe to communicate and get back lost information because ground data centers would be wiped out by EMP from blasts.
South Africa built nuclear weapons in the 1980s:
https://en.wikipedia.org/wiki/South_Africa_and_weapons_of_ma...
But it never had an orbital launch capability.
Pakistan doesn't have a domestic orbital launch capability but it does have nuclear weapons.
Surprisingly, the United Kingdom doesn't have a domestic orbital launch capability at present though it has had ballistic missiles and nuclear weapons for many decades.
At present, I would say that building a basic implosion-assembled atomic bomb is easier than building a rocket system that reach low Earth orbit. It's a lot easier to build a bomb now than it was in the 1940s. The main thing that prevents wider nuclear weapon proliferation is treaties and inspections, not inherent technical difficulties.
(If you can't xcancel it yourself your hacker card is revoked.)
High performance chips are made for the shielded atmosphere. Imagine the cost launching all the extra shielding that you don't need on earth.
It is beyond stupid. Comical levels. I can't believe people are trying to find any justification.
Hey! It can be de-orbited onto the location of your choosing. I bet you can sell this service to the DoD!
Barring that, you can sell it on the global market to the highest bidder.
I also see no reason to “lay down and die” as I feel is somewhat implied here. I think it’s a truly noble cause, but maybe I read too much sci-fi as a young lad.
[1] https://hackaday.com/2024/02/05/starlinks-inter-satellite-la... (and this is two years ago!) [2] https://resources.nvidia.com/en-us-accelerated-networking-re...
The answer to that is that coordination problems are really hard. Much harder even than what are currently unsolved engineering problems. In fact, SpaceX can only launch from California because they have DOD coverage for their launches. Otherwise the California Coastal Commission et al. would have blocked them entirely. Perhaps the innovation for affordable space Internet is combining it with mixed-use technology.
The truth is that in America today self-driving cars (regulated by a state board run by bureaucrats) are easier to build than trains (regulated by every property owner on the train route). Mark Zuckerberg tried to spend some money evaluating a train across the Bay and had to give up. But Robotaxi service is live in San Francisco.
So if there is an angle that makes sense to me it's that they anticipate engineering challenges beatable in a way where regulatory challenges are not.
You do this when the most fragile part in the system fails. Solar panels good for 25 years but the SSDs burn out after 2? Incinerate the lot!
This kind of thinking is late capitalist brain rot. This kind of waste should be a crime.
I mean, I still remember promises of $1000-per-kg for space launches, and how e.g. Gigafactory will produce half of the world battery supply, and other non-scientific fiction peddled by Musk. Remember when SpaceX suggested in 2019 that the US Army could use its Starship rockets to transport troops and supplies across the planet in minutes? I do. By the way, have they finished testing Starship yet, is it ready?
That’s how the CFO of OpenAI can essentially say “we need a Federal bailout”, and then turn around and say “lol just joking”.
I thought that was actually quite interesting/practical, because if there is a problem, you can just bury the problem.
not like tmi/fukushima/chernobyl
Can you not provide any type of shielding at scale to wrap a (small, not Google tier) data center? To be honest my criticism with TFA is its focus on “you can’t do massive scale” rather than the premise entirely.
The average temperature of deep space is approximately -270.45°C or 2.73 Kelvin), which is just above absolute zero. This baseline temperature is set by the Cosmic Microwave Background (CMB) radiatio...
Which is absolute nonsense, because vacuum has no temperature.
Is it really better than just using solar panels to run a heat pump?
You can make some part of operations on high orbit that won’t decay as much then more ops on lower orbits that decay faster.
If you put stuff underground it is much harder to communicate.
Datacenters in space have a lifespan measured in years. Single-digit years. Communicating with such an installation requires relatively advanced technology. In an extinction level crisis, there will be extremely little chance of finding someone with the equipment, expertise, and power to download bulk data. And don't forget that you have less than a decade to access this data before the constellation either fails or deorbits.
Meanwhile people who actually care about preserving knowledge in a doomsday crisis have created film reels containing a dump of GitHub and enough preamble that civilizations in the far future can reconstruct an x86 machine from scratch. These are buried under glaciers on earth.
We've also launched (something like) a microfilm dump of knowledge to the moon which can be recovered and read manually any time within the next several hundred or thousand years.
Datacenters in space don't solve any of the problems posed because they simply will not last long enough.
I also like reading how people argue with not what I wrote but with what they imagined I wrote.
The rocket equation will kick your ass every time.
Edit: Not trying to single out the above commenter, just the general “air” around this in all the comments.
I honestly believed folks on HN are generally more open minded. There’s a trillion dollar merger happening the sole basis of which is the topic of this article. One of those companies put 6-8,000 satellites to space on its own dime.
It’s not a stretch, had they put 5 GPUs in each of those satellites, they would have had a 40,000 GPU datacenter in space.
Also read by comment above that discusses WHY superconductors could be the key to cooler electronics in space.
Everything dies. Deal with it.
Instead of empowering shithead grifters who promise you a way out, grow trees to create shade for people you will never know. You do that by improving things, not burning limited resources on a conman.
It's cold there because there isn't anything there.
So there is nothing to conduct or convect the heat away.
It's like a giant vacuum insulated thermos.
Is putting data centers in thermos' a good idea?
There is also no matter to wick the heat away.
There is nothing wrong to imagine anything you like. But if you do it as a CEO, i personally consider that as fraud. Guess I'm weird and old-fashioned like that.
Radiation may be sufficient for the little heat that does get produced.
Have you ever spoken to someone who works at SpaceX? I have multiple friends in the industry, who have taken a trip through the company.
The overwhelming consensus is that - in meetings, you nod along and tell Elon "great idea". Immediately after you get back to real engineering and design things such that they make sense.
The folks working there are under no delusion that he has any business being involved in rocket science, it's fascinating that the general public doesn't see it that way.
Space is a vacuum. i.e. The lack-of-a-thing that makes a thermos great at keeping your drink hot. A satellite is, if nothing else, a fantastic thermos. A data center in space would necessarily rely completely on cooling by radiation, unlike a terrestrial data center that can make use of convection and conduction. You can't just pipe heat out into the atmosphere or build a heat exchanger. You can't exchange heat with vacuum. You can only radiate heat into it.
Heat is going to limit the compute that can be done in a satellite data centre and radiative cooling solutions are going to massively increase weight. It makes far more sense to build data centers in the arctic.
Musk is up to something here. This could be another hyperloop (i.e. A distracting promise meant to sabotage competition). It could be a legal dodge. It could be a power grab. What it will not be is a useful source of computing power. Anyone who takes this venture seriously is probably going to be burned.
https://en.wikipedia.org/wiki/Black-body_radiation
It has nothing to do with the movements of atoms, but just with the spectrum of photons moving through it. It means that eventually, any object left in space will reach that temperature. But it will not necessarily do it quickly, which is what you need if you're trying to cool something that is emitting heat.
Sufficient hype funds more work for his rocket company.
The more work they have the faster they can develop the systems to get to Mars. His pet project.
I really think it's that simple.
I also checked out your blog and got 2 interesting articles in 2 tries. If you have some personal favourites and listing them is not a bother, I'd be happy to read them.
They're reinventing physics? Wow! I guess they'll just use Grok AI to fake the launch videos. Should be good enough for the MVP.
For the superconductivity idea to work, the entire datacenter needs to be shielded both from sunlight and earthlight. This means a GINORMOUS sun shield to provide the required shadow. But wait, the datacenter will orbit the Earth, so it also will need to rotate constantly to keep itself in the shadow! Good luck with station-keeping.
There's a reason the Webb Telescope (which is kept at a balmy 50K) had to be moved to a Sun-Earth Lagrange point. Or why previous infrared telescopes used slowly evaporating liquid helium for cooling.
> I don’t understand what’s with the arrogance and skepticism.
Because it's a fundamentally stupid idea. Stupid ideas should be laughed out.
I'm not talking about "stupid because it's hard to do" but "stupid because of fundamental physical limitations".
Next up in the equation is surface emissivity which we’ve got a lot of experience in the automotive sector.
And finally surface area, once again, getting quite good here with nanotechnology.
Yes he’s distracting, no it’s not as impossible as many people think.
https://www.pbs.org/newshour/world/pentagon-embraces-musks-g...
Data centers in space make absolute sense when you want as close to real time analysis on all sorts of information. Would you rather have it make the round trip, via satellite to the states? Or are you going to build these things on the ground near a battlefield?
Musk is selling a vision for a MASSIVE government contract to provide a service that no one else could hope to achieve. This is one of those projects where he can run up the budget and operating costs like Boeing, Northrup etc, because it has massive military applications.
So your hot thing is radiating directly onto the next hot thing over, the one that also needs to cool down?
As an alleged human, I'd like to preserve my option to interfere.
So you're talking about an entirely different scale of power and needed cooling.
Assuming he built this in LEO (which doesn't make sense because of atmospheric drag), and the highest estimates for what starship could one day deliver to LEO (200 metric tons), and only 1 metric ton of radiators per 100KW, that's 50 launches just to carry up the radiators.
Sure, space is cold. Good luck cooling your gear with a vacuum.
Don't even get me started on radiation, or even lack of gravity when it comes to trying to run high powered compute in space. If you think you are just going to plop a 1-4U server up there designed for use on earth, you are going to have some very interesting problems pop up. Anything not hardened for space is going to have a very high error/failure rate, and that includes anything socketed...
It appears to have come out of a crack pipe.
Sadly, they also don't compute.
> Even the cheapest kind will superconduct in space (because it’s so cold).
Is this a drinking game? Take a drink whenever someone claims that heat is not a problem because space is cold? Because I'm going to have alcohol poisoning soon.
Let's see how cold you feel when you leave the Earth's shadow and the sun hits you.
So whenever I see here or anywhere else that your ideas mean nothing I just laugh at it. Of course, these come from people who are bland, doesn't have any imagination and they are not creative at all at all, but they have brute force, which is money.
Where will they go, nobody knows!
The moon has:
- Some water
- Some materials that can be used to manufacture crude things (like heat sinks?)
- a ton of area to brute force the heat sink problem
- a surface to burry the data centers under to solve the radiation problem
- close enough to earth that remote controlled semi-automated robots work
I think this would only work if some powerful entity wanted to commit to a hyper-scale effort.
The reason we dont have a lot of compute in space, is because of the heat issue. We could have greater routing density on communication satellites, if we could dissipate more heat. If Starlink had solved this issue they would have like triple the capacity and could just drop everything back to the US (like their fans think they do) rather than trying to minimise the number of satellites traffic passes through before exiting back to a ground station usually in the same country as the source. In fact, conspiratorially, I think thats the problem he wants to solve. Because wet dreams of an unhindered, unregulated, space internet are completely unanswered in the engineering of Starlink.
I have actually argued this from the other side, and I reckon space data centres are sort of feasible in a thought experimental sense. I think its a solvable problem eventually. But heat is the major limiting factor and back of the napkin math stinks tbh.
IIRC the size/weight of the satellite is going to get geometrically larger as you increase the compute size due to the size of the required cooling system. Then we get into a big argument about how you bring the heat from the component to the cooling system. I think oil, but its heavy again, and several space engineering types want to slap me in the face for suggesting it. Some rube goldberg copper heatpipe network through atmosphere system seems to be preferred.
I feel like, best case, its a Tesla situation, he clears the legislative roadblocks and solves some critical engineering problem by throwing money at it, and then other, better people step in to actually do it. Also triple the time he says it will take to solve the problem.
And then, ultimately, as parts fail theres diminishing returns on the satellite. And you dont even get to take the old hardware to the secondary market, it gets dropped in the ocean or burnt up on reentry.
1. Inference
2. Training
Training is a whole other ballgame. It is parallelisable, sure, but only through heroic efforts involving fantastically expensive network switches with petabits of aggregated bandwidth. It also needs more general-purpose GPUs, access to petabytes of data, etc. The name of the game here is to bring a hundred thousand or more GPUs into close proximity and connect them with a terabit or more per GPU to exchange data. This cannot be put into orbit with any near-future technologies! It would be a giant satellite with square kilometers of solar and cooling panels. It would certainly get hit sooner or later by space debris, not to mention the hazard it poses to other satellites.
The problem with putting inference-only into space is that training still needs to go somewhere, and current AI data centres are pulling double-duty: they're usable for both training and inference, or any mix of the two. The greatest challenge is that a training bleeding edge model needs the biggest possible clusters (approaching a million GPUs!) in one place, and that is the problem -- few places in the world can provide the ~gigawatt of power to light up something that big. Again, the problem here is that training workloads can't be spread out.
Space solves the "wrong" problem! We can distribute inference to thousands of datacentre locations here on Earth, each needs just hundreds of kilowatts. That's no problem.
It's the giaaaant clusters everyone is trying to build that are the problem.
My car doesn't spend too much time driving in vacuum, does yours?
Almost any reason why the moon is better than in orbit is a point for putting it on earth.
https://en.wikipedia.org/wiki/External_Active_Thermal_Contro...
[1] https://en.wikipedia.org/wiki/External_Active_Thermal_Contro...
Didn't think so.
Currently available superconductors still need liquid nitrogen cooling, meaning they're not feasible for in-orbit installations.
No. Nearly everyone that talks about data centers in space talks about cooling. The point of this article was to talk about other problems that would remain even if the most commonly talked about problems were solved.
It says:
> But even if we stipulate that radiation, cooling, latency, and launch costs are all solved, other fundamental issues still make orbital data centers, at least as SpaceX understands them, a complete fantasy.
and then talks about some of those other issues.
It probably increases Elon's share of the combined entity.
It delivers on a promise to investors that he will make money for them, even as the underlying businesses are lousy.
I have long theorized there will be some game changing manufacturing processes that can only be done in a zero gravity environment. EX:
- 3d printing human organ replacements to solve the organ donor problem
- stronger materials
- 3d computer chips
I do not work in material science, so these crude ideas are just that, but the important part I'm getting at is that we can make things in space without any launches once that industry is bootstrapped.
[0] https://images-assets.nasa.gov/image/jsc2021e064215_alt/jsc2...
Data centers in space are the same kind of justification imo.
This looks like a valid argument to me, yes. Elon mentioned 1,000,000 satellites - I'm thinking about 3rd version of Starlink as a typical example, 2 tons, 60 satellites per Starship launch, 16,000 Starship launches for the constellation, comparing with 160 launches per year of today's Falcon 9...
The argument about problems of dissipating heat still stands - I don't see a valid counterargument here. Also "SAPCE" problem looks different from the point of view of this project - https://www.50dollarsat.info/ . Basically, out launch costs go way down, and quality of electronics and related tech today on Earth is high enough to work on LEO.
A heat pump is a “ vapor-compression based cooling system” so that tech is an addition-to not an instead-of.
Whether it’s better probably depends on how expensive the additional efficiency is in practice.
> SkyCool’s Panels save 2x – 3x as much energy as a solar panel generates given the same area.
So if you’re area constrained maybe.
I keep seeing that term, but if it does not mean "AI arms race" or "AI surveillance race", what does it mean?
Those are the only explanations that I have found, and neither is any race that I would like to see anyone win.
Author made a fatal mistake. By flying enough hardware in space, you can simply blot out the sun and steal their solar capacity. Drink their milkshake with a long straw!
I've heard stories that over a decade ago teams inside hyperscalars had calculated that running completely cryogenically cooled data centers would be vastly cheaper than what we do now due to savings on resistive losses and the cost of eliminating waste heat. You don't have to get rid of heat that you don't generate in the first place.
The issue is that at the moment there are very few IC components and processes that have been engineered to run at cryogenic temperatures. Replicating the entirety of the existing data center stack for cryogenic temps is nowhere near reality.
That said, once you have cryogenic superconducting integrated circuits you could colocate your data centers and your propellant/oxidizer depots. Not exactly "data centers off in deep space" since propoxd tend to be the highest traffic areas.
Those are just some guesses. Some of those could also explain the "why" for SpaceX Falcon Heavy and it's future iterations. It can carry 63,800 kg (140,660 lbs) to Low Earth Orbit and that load capacity will only increase with future versions.
tl;dr: civilizations advanced enough to travel between stars end up trapped by the resources and physics required to keep up with the Joneses.
Also the same issue with radiative cooling pops up for space solar cells - they tend to run way hotter than on Earth and that lowers their efficiency relative to what you could get terrestrially.
Off on a tangent here but I'd love for anyone to seriously explain how they believe the "AI race" is economically winnable in any meaningful way.
Like what is the believed inflection point that changes us from the current situation (where all of the state-of-the-art models are roughly equal if you squint, and the open models are only like one release cycle behind) to one where someone achieves a clear advantage that won't be reproduced by everyone else in the "race" virtually immediately.
There should be some temperature where incoming radiation (sunlight) balances outgoing radiation (thermal IR). As long as you're ok with whatever that temperature is at our distance from the sun, I'd think the only real issue would be making sure your satellite has enough thermal conductivity.
Engineering is always a question of tradeoffs.
Launch costs are dropping, and we’re still using inefficient rockets. Space elevators & space trains, among others, can drop this much more, the launch costs are still dropping, even using rockets, maybe we’ll never get to elevators & trains the costs will drop so low!
Radiation shielding is not required for VLEO or LEO, and phenomenally more capable aerospace processors are near - hi Microchip Inc! There are many other radiation solutions coming, no doubt with nuclear power.
Satellites can be upgraded at scale, though for many things, it does not make $ sense to upgrade them, but fuel , reaction wheels, solar panels, among other things do make $ sense to replace.
Latency was technically solved in 1995 & 2001 with the first laser comms missions NASDA’s ETS-VI kiku-6 and ESA’s Artemis , and Laser crossbars for comms are common. A full laser TDRS no RF is not yet extant but soon. Earth to deepspace was just demonstrated by ESA.
Cooling can be significantly improved due to lower launch costs, heat piping, RTGs, TEGs, and thermoradiative cells, not to mention sunside solar and darkside inline radiators
Furthermore, it is very likely that as neuromorphics with superior SWaP emerge, we could see very different models of space based computation.
Economic tradeoffs should drive many of these decisions as I’m not discussing the other applications of datacenter in space
https://www.cbc.ca/news/canada/saskatoon/spacex-cbc-debris-s...
- have very non-deterministic latency
- are located outside of a country that can protect you (ie China could disrupt your space data center)
- have to pay millions of dollars to swap out hardware
I agree. I would be quite a moonshot.
Not that the UK manufactures trident missiles anyway.
A lot of people will invest in this because "it's the future" and a few will make a lot of money on that.
Seems like quite a massive difference to ignore.
A Starlink satellite uses about 5K Watts of solar power. It needs to dissipate around that amount (+ the sun power on it) just to operate. There are around 10K starlink satellites already in orbit, which means that the Starlink constellation is already effectively equivalent to a 50 Mega-watt (in a rough, back of the envelope feasibility way).
Isn't 50MW already by itself equivalent to the energy consumption of a typical hyperscaler cloud?
Why is starlink possible and other computations are not? Starlink is also already financially viable. Wouldn't it also become significantly cheaper as we improve our orbital launch vehicles?
Specifically: Starship makes no economic sense. There simply isn’t any pre-existing demand for the kind of heavy lift capacity and cadence that Starship is designed to deliver. Nor is there anyone who isn’t currently launching heavy payloads to LEO but the only thing holding them back is that they need weekly launches because their use case demands a whole lot of heavy stuff in space on a tight schedule and that’s an all-or-nothing thing for them.
So nobody else has a reason to buy 50 Starship launches per year. And the planned Starlink satellites are already mostly in orbit. So what do you do? Just sell Starship to xAI, the same way he fixed Cybertruck’s demand problem by selling heaps of them to SpaceX.
Taking a creative step back, perhaps datacenters in space support something with Mars?
As much as that might not seem realistic, I also have to counterbalance it with operationalizing and commercializing SpaceX, Starlink and Tesla relatively quickly when so much stays at the R&D stage for so long.
Either way, this isn't about 3D printing organs, this is about launching AI compute into space. To do important stuff, like making AI generated CSAM without worry of government intervention.
Putting data centers in space keeps them out of reach of humans with crowbars and hammers, which may have been a vulnerability for those robots Tesla is building.
That's wise.
However, TFA's purpose in assuming cooling (and other difficulties) have been worked out (even though they most definitely have not) was to talk about other things that make orbital datacenters in space economically dubious. As mentioned:
But even if we stipulate that radiation, cooling, latency, and launch costs are all solved, other fundamental issues still make orbital data centers, at least as SpaceX understands them, a complete fantasy. Three in particular come to mind:And nobody ever calls them out on it.
Today's data centres are optimised for reliability, redundancy, density, repairability, connectivity and latency. Most of advertised savings come not from placing the data centre in space, but the fact that advocates have argued away the need for absolutely everything that modern data centres are designed to supply, except for the compute.
If they can really build a space data centre satellite for as cheap as they claim, why launch it? Just drive it out into the middle of the desert and dump it there. It can access the internet via starlink, and already has solar panels for power and radiators for cooling. IMO, If it can cool itself in direct sunlight in space, it can cool itself in the desert.
The main thing that space gains you over setting up the same satellite in the desert is ~23 hours of power, vs the ~12 hours of power on the ground. And you suddenly gain the ability to repair the satellite. The cost of the launch would have to be extremely cheap before the extra 11ish hours of runtime per day outweighed the cost of a launch; Just build twice as many "ground satellites".
And that's with a space optimised design. We can gain even more cost savings by designing proper distributed datacenter elements. You don't need lightweight materials, just use steel. You can get rid of the large radiators and become more reliant on air cooling. You can built each element bigger, because you don't have to fit the rocket dimensions. You could even add a wind turbine, so your daily runtime isn't dependant on daylight hours. Might even be worth getting rid of solar and optimising for wind power instead.
An actual ground optimised design should be able to deliver the same functionality as the space data centre, for much cheaper costs. And it's this ground optimised distributed design that space data centres should be compared to, not today's datacenter which are hyper-optimised for pre-AI use cases.
-------------------
Space data centres are nothing more than a cool Sci-Fi solution looking for a problem. There have been mumblings for years, but they were never viable (even bitcoin mining was a bit too latency sensitive). Space data centre advocates have been handed a massive win with this recent AI boom, it's the perfect problem for their favourite solution to solve.
But because it's a solution looking for a problem, they are completely blind to other solutions that might be an even better fit.
We can tell because it’s not being treated as a serious goal. 100% of the focus is on the big vroom vroom part that’s really exciting to kids who get particularly excited by things that go vroom, and approximately 0% of the focus is on developing all the less glamorous but equally essential components of a successful Mars mission, like making sure the crew stays healthy.
And some of us are reading these things and trying to be polite.
But at some point patience runs thin and the only response that breaks through the irrationality is some variation of "what if unicorns and centaurs had teamed up with Sauron?"
The limit of the ratio of useful:useless "what if's" approaches zero.
Once upon a time there was a bonkers "rods from god" mass bomb idea, but that didn't work either.
But when they say, "Win the AI race," they mean, "Build the machine god first." Make of this what you will.
A few things I think of more frequently than they affect my life are:
* https://wiki.roshangeorge.dev/w/Abolish_The_First_Lady - arguing that the FLOTUS role shouldn't exist
* https://wiki.roshangeorge.dev/w/Upward_Mobility,_Downward_So... - perhaps a less original idea that economic mobility leads to poorly performing lower-paying services.
* https://wiki.roshangeorge.dev/w/Blog/2026-01-17/Citogenesis - an example of one way that factoids get upgraded to facts
Oh.
Is it below the level where mining and blockchain updates become uneconomic yet?
You could have said the same thing about Europe or America. We could have just stayed in Africa, and the people like you did. But taking the leap worked pretty well, even if it was tough at the beginning.
The website insists that you let it record your voice in order to show you the dangers of AI. Is it trolling the visitor? https://civai.org/talk
This is just a question. I have no expertise at all with this.
1. The capital costs are higher, you have to expend tons of energy to put it into orbit
2. The maintenance costs are higher because the lifetime of satellites is pretty low
3. Refurbishment is next to impossible
4. Networking is harder, either you are ok with a relatively small datacenter or you have to deal with radio or laser links between satellites
For starlink this isn't as important. Starlink provides something that can't really be provided any other way, but even so just the US uses 176 terawatt-hours of power for data centers so starlink is 1/400th of that assuming your estimate is accurate (and I'm not sure it is, does it account for the night cycle?)
i think the moon likely does contain vast mineral deposits though. when europeans first started exploring australia they found mineral anomalies that havent existed in europe since the bronze age.
the Pilbara mining region is very cool. it contains something like 25% of the iron ore on earth, and it is mostly mined using 100% remote controlled robots and a custom built 1000 mile rail network that runs 200-300 wagon trains, mostly fully automated. it is the closest thing to factorio in real life. 760,100 tonnes a year of iron ore mined out and shipped to China.
take an h100 for example. it will need something like 1kW to operate. that's less than 4 square meters of solar panel
at 70C, a reasonable temp for H100, a 4 square meter radiator can emit north of 2kW of energy into deep space
seems to me like a 2x2x2 cube could house an H100 in space
perhaps I'm missing something?
You're saying they're going to steal the night? We'll see the sun in the day, radiative cooling for surveillance AI in the time formerly known as night?
I'll confess that the numbers aren't nearly as bad as I'd thought. Apparently, you can dissipate 1MW at 100°C with a 17m diameter sphere at night. So it's like the size of a small house. It doesn't even glow. On the other hand, you need a lot of temperature differential to move the heat out fast enough, which means your TPUs are going to be hellishly hot.
Though you'd probably only run it when it's in the sun and radiate in other directions, so you don't have to store the power in heavy batteries. You need a 56m diameter disk of solar panels to provide 1MW, don't forget that.
(All figures were vibe calculated with Claude and are unchecked.)
All in all, the cooling system would likely consume more energy than the compute parts.
requires a lot of weight (cooling fluid). requires a lot of materials science (dont want to burn out radiator). requires a lot of moving parts (sun shutters if your orbit ever faces the sun - radiator is going to be both ways).
so that sounds all well and good (wow! 4th power efficiency!) but it's still insanely expensive and if your radiator solution fucks up in any way (in famously easy to service environment space) then your entire investment is toast
now i havent run the math on cost or what elon thinks the cost is, but my extremely favorable back of hand math suggests he's full of it
Presumably they're planning on doing in-orbit propellant transfer to reboost the satellites so that they don't have to let their GPUs crash into the ocean...
Depth below surface | Typical temperature (°C) | Indicative cost to drill 1.2 m diameter hole
500 m | 15–25 | $5–10 million
1 km | 25–40 | $10–20 million
2 km | 50–70 | $25–45 million
3 km | 75–100 | $50–80 million
4 km | 100–130 | $90–140 million
5 km | 130–160 | $150–250 million
That specific aspect is NOT true in space because there's nothing stopping thermal radiation.
Now you're correct that you can't remove heat by conduction or convection in space, but it's not that hard to radiate away energy in space. In fact rocket engine nozzle extensions of rocket upper stages depend on thermal radiation to avoid melting. They glow cherry red and emit a lot of energy.
By Stefan–Boltzmann law, thermal radiation goes up with temperature to the 4th power. If you use a coolant that lets your radiator glow you can conduct heat away very efficiently. This is generally problematic to do on Earth because of the danger of such a thing and also because such heat would cause significant chemical reactions of the radiator with our corrosive oxygen atmosphere.
Even without making them super hot, there's already significant energy density on SpaceX's satellites. They're at around 75 kW of energy generation that needs to be radiated away.
And on your final statement, hyperloop was not used as a "distraction" as he never even funded it. He had been talking about it for years and years until fanboys on twitter finally talked him into releasing that hastily put together white paper. The various hyperloop companies out there never had any investment from him.
entirely out of jurisdiction, where it is prohibitively expensive to travel, and impractical for any physical seizure.
you dont need to compute, just store it and P2P amongst satellites.
essentially an orbital NAS.
Given the solar constant 1361 W/m^2, you can calculate the temperature range based on the emissivity and absorptivity. With the right shape and “color”, the equilibrium temperature can be cooler than most people thought.
I suppose that a space data center powered 100% by solar is no different than this iron ball in principle.
But there should be plenty of options once you start actually optimising for the same use-case as space data centres. Many places have very predictable wind (especially off-shore, which gives you bonus access to cooling water). Or maybe you could set up small hydro power schemes along remote rivers.
Seems like a pretty obvious "no" to me. Loudoun County is a much better choice, just to pick one alternative. Antarctica is an awfully inhospitable place and running a data center there would be a nightmare.
And yet it's way better than space. It's much easier to get to. Cooling is about a thousand times easier. The radiation environment is much more forgiving.
This whole concept is baffling to me.
(Incidentally, a similar thought experiment is useful when talking about colonizing Mars. Think about colonizing the south pole. Mars is a harsher environment in just about every way, so take the difficulties of colonizing the south pole and multiply them.)
And hardware that is happy in high-radiation environments is not going to be fast.
what am I missing here?
It's not physically impossible. Of course not. It's been done thousands of times already. But it doesn't make any economic sense. It's like putting a McDonald's at the top of Everest. Is it possible? Of course. Is it worth the enormous difficulty and expense to put one there? Not even a little.
If SpaceX, by being a company serving the federal government are covered by a law that would make its offices (on Earth, duh) a protected area ... then could they by some law-bending make that protection also encompass the data centres that contain the AI-generated CSAM and training data, in order to protect them from being raided by state law enforcement?
That does not have to sound reasonable to us ... only to Musk.
plus you would have to insulate the servers from the sun...then have radiators like the ISS... i think its just way easier to run a server on the ground
You might only care about coding models, but text is dominating the market share right now and Grok is the #2 model for that in arena rankings.
I'm taking the parts of this write-up I don't have expertise with a grain of salt after seeig this.
Kessler cascades are real. Particularly at high altitudes. They're less of a problem in LEO. And in no case can they "[cripple] our access to space." (At current technology levels. To cripple access to space you need to vaporise material fractions of the Earth's crust into orbit.)
It's average outbut is like half of that though. So something the size of the space station, a massive thing which is largely solar panels and radiators, can do like 120kW sustained. Like 1-2 racks of GPUs, assuming you used the entire power budget on GPUs.
And we're going to build and launch millions of these.
It's a way to get cheap capital to get cool tech. (Personal opinion.)
Like dark fibre in the 1990s, there will absolutely–someday–be a need for liquid-droplet radiators [1]. Nobody is funding it today. But if you stick a GPU on one end, maybe they will let you build a space station.
Minus one big one: permitting. Every datacentre I know going up right now is spending 90% of their bullshit budget on battlig state and local governments.
Hell, you're going to lose some fraction of chips to entropy every year. What if you could process those into reaction mass?
xAI’s first data center buildout was in the 300MW range and their second is in the Gigawatt range. There are planned buildouts from other companies even bigger than that.
So data center buildouts in the AI era need 1-2 orders of magnitude more power and cooling than your 50MW estimate.
Even a single NVL72 rack, just one rack, needs 120kW.
Same with datacenters in space, not today, but in 1000 years definitely, 100 surely, 10?
As for the economics, it makes about as much sense as running jet engines at full tilt to power them.
A single AI rack consumes 60kW, and there is apparently a single DC that alone consumes 650MW.
When Microsoft puts in a DC, the machines are done in units of a "stamp", ie a couple racks together. These aren't scaled by dollar or sqft, but by the MW.
And on top of that... That's a bunch of satellites not even trying to crunch data at top speed. No where near the right order of magnitude.
Apparently [1]. But "when ketamine is heated, its chemical structure degrades, reducing its potency."
[1] https://innervoyagerecovery.com/can-you-smoke-ketamine/
(Going to go ahead and VPN to my home connection from this airport Wi-fi.)
I'm no expert on solar but I thought there was some upper limit on how much power ground-based solar panels can generate per area based on how much energy gets through the atmosphere all the way to ground - and that panel efficiency was approaching that limit.
However, I don't doubt ground-based panels can continue to improve in cost and other metrics and thus exert competitive pressure on space-based solutions.
Modulo some efficiency losses, most of the electricity it generates is leaving the satellite. Contrast with a datacenter, where most of the energy is spent heating up the chips, and the rest is spent moving the heat away from those chips.
Have you considered the effects of insolation? Sunlight heats things too.
How efficient is your power supply and how much waste heat is generated delivering 1kW you your h100?
How do you move data between the ground and your satellite? How much power does that take?
If it's in LEO, how many thermal cycles can your h100 survive? If it's not in LEO, go back to the previous question and add an order of magnitude.
I could go on, but honestly those details - while individually solvable - don't matter because there is no world where you would not be better off taking the exact same h100 and installing it somewhere on the ground instead
I also remember, roughly 10 years ago, people saying that the amount of effort to discredit bullshit is wildly out of whack. Which makes bullshit basically asymmetric warfare.
So here we are, in this thread, actually spending time attempting to discredit bullshit.
> Musk admitted to his biographer Ashlee Vance that Hyperloop was all about trying to get legislators to cancel plans for high-speed rail in California—even though he had no plans to build it.
https://time.com/6203815/elon-musk-flaws-billionaire-visions...
1. every gram you need to send to space is costly, a issue you don't have at ground level
2. cooling is a catastrophe, sure space is cold, but also a vacuum, so the cooling rate is roughly the infrared radiation rate. This means if you are not careful with the surface of a satellite it can end up being very slowly cooked by sunlight alone not including running any higher heat producing component (as it absorbs more heat from sunlight then it emits, there is a reason satellites are mostly white, silver or reflective gold in color). Sure better surface materials fix that, but not to a point where you would want to run any heavy compute on it.
3. zero repair-ability, most long running satellites have a lot of redundancy. Also at least if you are bulk buying Nvidea GPGPUs on single digit Million Euro basis it's not rare that 30% have some level of defect. Not necessary "fully broken" but "performs less good then it should/compared to other units" kind of broken.
4. radiation/solar wind protections are a huge problem. Heck even if you run things on earth it's a problem as long as your operations scale is large enough. In space things are magnitudes worse.
5. every rocket lunch causes atmospheric damage, so does every satellite evaporating on re-entry. That wasn't that relevant in the past, but might become a problem just for keeping stuff like Starlink running. We don't need to make it worse by putting datacenters into space.
6. Kessler Syndrom is real and could seriously hurt humanity as a whole, no reason to make it much more likely by putting things into space which don't need to go there.
Last but not least, wtf would you even want to do it?
There is zero benefit, non nada.
Any other firm, you mean like the bloated and bureaucratic NASA/JPL/defense contractor madhouse? That's not much competition.
> Why has Tesla been successful? Why is xAI pretty similar in terms of approach? My idea has less variables than yours. It also doesn't fly with his tendency to fire people.
Your "idea" (statement) is that his companies are successful due to his micromanagement. In reality, they're successful in spite of it. Like all impactful engineering institutions, there are incredibly talented people working at the "bottom" levels of these companies that hold the whole thing together.
There's a good bit of irony here in your thought that he'd fire people that didn't agree with him or disobeyed him. From what I've heard, he lacks the technical rigor to even understand how what was implemented differs from his totally awesome and cool, off the cuff, reality adjacent ideas.
The myth of the supergenius CEO has real potential to influence investors, beyond that, the hard engineering is up to the engineers. Period. SpaceX wouldn't have gotten past o-ring selection with Elon at the engineering helm.
Anyone planning expenditures as large as a modern data center thinks about all kinds of risks (earthquakes, climate, power, etc), and so perhaps there is a premium for GPUs that are out of the reach of your median angry unemployed guy.
(yes, this is nuts, but I can easily imagine some fever-dream pitch meeting where Musk is talking about it)
Yeah, pumps, tubes, and fluids are some of the worst things to add to a satellite. It's probably cheaper to use more radiators.
Maybe it's possible to make something economical with Peltier elements. But it's still not even a budget problem yet, it's not plainly not viable.
> getting quite good here with nanotechnology
Small features and fractal surfaces are useless here.
Not to go all Ian Malcolm, but half this comment section is spending so much time wondering if we could build a space data center, without stopping to ask if it made any goddamn sense whatsoever to do so.
They have no path to paying for their existence unless they drastically increase usage. There aren't going to be very many big winners in this segment and xAI's expenses are really really big.
If (as seems to be the case) nobody can identify a specific source of latent demand that is large enough to soak up the two order of magnitude increase in the supply of heavy lift launch capacity that Elon wants to deliver, then that strongly suggests that SpaceX does not actually have a business plan for Starship. Or at least, not a business plan that’s been thought through as clearly as a $5 billion (and counting) investment would warrant.
“Defense” is not nearly specific enough to count as an answer. What kind of defense application, specifically, do you have in mind, and why does it need specifically this kind of heavy lift capacity to be viable?
Then he talked about datacenters in space and this is something I have some appreciation for, and I immediately knew he couldnt have done much Physics, and sure enough, I was right.
There are "experts" out there who basically have no idea what they are talking about, "it is absolute zero in space in the shadow!", as though radiative cooling is that effective.
And that's not even talking about part failures. How do we replace failed parts in space? This is a scam, but everybody is afraid to openly challenge eloquent "experts" who are confidently wrong.
Perhaps space based DCs allow for expansion into ITAR controlled countries and/or sanctioned countries/individuals.
Maybe throw in the fact that nobody can REALLY verify system behavior once its up there. So NSA/CIA etc sure are chomping at the bit to allow it.
I'm sure there's others I haven't thought of- probably less outlandish/tinfoily as well.
The sentence you mention was indeed a give away, but there are many others. Worst case scenario, nothing works and Elon burns a bunch of money, part of which goes into jobs and research. Best case scenario, we actually move away from technologies from the 50's and end up with daily, cheap earth-to-low-orbit (ideally something better than that - how about the moon?), no more whining about energy costs, and laser communication IRL. That's just the obvious stuff.
Being "realistic" and "having a budget" is what companies like Google do. That's all good, but we have enough of those already.
putting 1KW of solar on land - $2K, putting it into orbit on Starship (current ground-based heavy solar panels, 40kg for 4m2 of 1KW in space) - anywhere between $400 and $4K. Add to that that the costs on Earth will only be growing, while costs in space will be falling.
Ultimately Starship's costs will come down to the bare cost of fuel + oxidizer, 20kg per 1kg in LEO, i.e. less than $10. And if they manage streamlined operations and high reuse. Yet even with $100/kg, it is still better in space than on the ground.
And for cooling that people so complain about without running it in calculator - >>46878961
>2. The maintenance costs are higher because the lifetime of satellites is pretty low
it will live those 3-5 years of the GPU lifecycle.
Listen, I totally agree, the tech makes absolutely no sense. It does not. But the fact that someone is willing to spend money on figuring this out is pretty good. The worst thing is going to happen, we'll have a cheaper space travel. And let the guys to have the first hit at it, wasting money on an enormous amount of research needed.
Ain't my money being spent.
As long as we don't have to use Russian rockets to send the US payload to the orbit, I'm cool with it.
Is the plan to have everyone so hopelessly dependent on their product that they grit their teeth and keep on paying?
Well, maybe "higher", but not really high.
The lower the altitude, the larger the odds of making one, in a quadratic fashion. But also the lower the altitude, the less time it will last.
There is some space where it lasts basically forever but is small enough for it to happen. It's higher than LEO, and way lower than things like GEO.
Office? Dead. Box? Dead. DropBox? Dead. And so on. They'll move on anything that touches users (from productivity software to storage). You're not going to pay $20-$30 for GPT and then pay for DropBox too, OpenAI will just do an Amazon Prime maneuver and stack more onto what you get to try to kill everyone else.
Google of course has a huge lead on this move already with their various prominent apps.
They make no sense otherwise.
The only other thing I can think of is the whole thing is just a scheme to get investment and they’re never going to actually go through with it.
At this point I kind of think the former is more likely.
Peltiers generate a lot of heat to get the job done so even though electricity is pretty much free, probably not a sure bet.
All satellites launched into orbit these days are required to have de-orbiting capabilities to "clean up" after EOL.
I dunno, two years ago I would have said municipal zoning probably ain't as hard to ignore as international treaties, but who the hell knows these days.
Radiative power is really efficient for hot things but not so great when you're trying to keep things down to normal levels. Efficient for shedding heat from a sun but not so much for keeping a cpu from overheating...
1. Getting things to space is incredibly expensive
2. Ingress/egress are almost always a major bottleneck - how is bandwidth cheaper in space?
3. Chips must be “Rad-hard” - that is do more error correcting from ionizing radiation - there were entire teams at NASA dedicated to special hardware for this.
4. Gravity and atmospheric pressure actually do wonders for easy cooling. Heat is not dissipated in space like we are all used to and you must burn additional energy trying to move the heat generated away from source.
5. Energy production will be cheaper from earth due to mass manufacturing of necessary components in energy systems - space energy systems need novel technology where economies of scale are lost.
Would love for someone to make the case for why it actually makes total sense, because it’s really hard to see for me!
- let's say 8x 800W GPUs and neglect the CPU, that's 6400W
- let's further assume the PSU is 100% efficient
- let's also assume that you allow the server hardware to run at 77 degrees C, or 350K, which is already pretty hot for modern datacenter chips.
Your radiator would need to dissipate those 6400W, requiring it to be almost 8 square meters in size. That's a lot of launch mass. Adding 50 degrees will reduce your required area to only about 4.4 square meters with the consequence that chip temps will rise by 50 degrees also, putting them at 127 degrees C.
No CPU I'm aware of can run at those temps for very long and most modern chips will start to self throttle above about 100
Source? I can't immediately find anything like that.
It's a stock worth $50-60 with generous valuation. The premium is the Elon bullshit and grift. That isn't gonna last forever.
And maintenance and replacing parts and managing flights and ... You're trying to yadda-yadda so much opex here!
> an engineering and physics problem that he will somehow solve
no he won't
How much does it cost to launch just the mass of something that big?
Do you see how unrealistic this is?
Given that budget, I can bundle in a SMR nuclear reactor and still have change left.
1. Assuming 500,000 USD in permitting costs. See 2.
2. Permits and approvals: Building permits, environmental assessments, and utility connection fees add extra expenses. In some jurisdictions, the approval process alone costs hundreds of thousands of dollars. https://www.truelook.com/blog/data-center-construction-costs
3. Assuming a 60MW facility at $10M/MW. See 4.
4. As a general rule, it costs between $600 to $1,100 per gross square foot or $7 million to $12 million per megawatt of commissioned IT load to build a data center. Therefore, if a 700,000-square foot, 60-megawatt data center were to be built in Northern Virginia, the world’s largest data center market, it would cost between $420 million and $770 million to construct the facility, including its powered shell and equipping the building with the appropriate electrical systems and HVAC components. https://dgtlinfra.com/how-much-does-it-cost-to-build-a-data-...
It's perfectly possible to put small data centres in city centres and pipe the heat around town, they take up very very little space and if you're consuming the heat, you don't need the noisy cooling towers (Ok maybe a little in summer).
Similarly if you stick your datacentre right next to a big nuclear power plant, nobody is even going to notice let alone care.
1) Kessler syndrome is a contingency.
2) This is a logistics issue, not a physical impossibility.
3) Those are different tradeoffs (solar in space). There is not really an argument there.
All in all this is extremely weak reasoning, which is quite the contrast with the definitive title.
I throw this to the "nerds need to feel smarter than Elon" pile of articles. :)
A datacenter costs ~$1000/ft^2. How much equipment per square foot is there? say 100kg (1 ton per rack plus hallway). Which is $1000 to put into orbit on Starship at $100/kg. At sub-$50/kg, you can put into orbit all the equipment plus solar panels and it would still be cheaper than on the ground.
if the current satellite model dissipates 5kW, you can't just add a GPU (+1kW). maybe removing most of the downlink stuff lets you put in 2 GPUs? so if you had 10k of these, you'd have a pretty high-latency cluster of 20k GPUs.
I'm not saying I'd turn down free access to it, but it's also very cracked. you know, sort of Howard Hughesy.
They don't do RAD hardening on chips these days, they just accept error and use redundant CPUs.
Reusable rockets make no sense.
Autonomous cars make no sense.
Data centers in space make no sense. <--- You are here.
Humanoid robots make no sense.
Datacenters already exist. Putting datacenters in space does not offer any new capabilities.
More convenient. But I'm balancing the cost equation. There are regimes where this balances. I don't think we're there yet. But it's irrational to reject it completely.
> Or put it on a boat, which is still 100 times more sensible than outer space
More corrosion. And still, interconnects.
Now that I think of it, a big hydro dam would be perfect: power and cooling in one place.
What do you and them know that the countless extremely successful engineers who actually worked with Elon do not?
https://erik-engheim.medium.com/is-elon-musk-just-a-sales-gu...
Gemini is practically guaranteed. With the ad model already primed, their financial resources, their traffic to endlessly promote Gemini (ala Chrome), their R&D capabilities around AI, their own chips, crazy access to training data, and so on - they'd have to pull the ultimate goof to mess up here.
Microsoft is toast, short of a miracle. I'd bet against Office and Windows here. As Office goes down, it's going to take Windows down with it. The great Office moat is about to end. The company struggles, the stock struggles, Azure gets spun off (unlock value, institutional pressure), Office + Windows get spun off - the company splits into pieces. The LLMs are an inflection point for Office and Microsoft is super at risk, backwards regarding AI and they're slow. The OpenAI pursuit as it was done, was a gigantic mistake for Microsoft - one of the dumbest strategies in the history of tech, it left them with their pants down. Altman may have killed a king by getting him to be complacent.
Grok is very unlikely to make it (as is). The merger with SpaceX guarantees its death as a competitor to GPT/Gemini/Claude, it's over. Maybe they'll turn Grok into something useful to SpaceX. More likely they'll slip behind and it'll die rapidly like Llama. The merger is because they see the writing on the wall, this is a bailout to the investors (not named Elon) of xAI, as the forced Twitter rollup was a bailout for the investors of Twitter.
Claude is in a weird spot. What they have is not worth $300-$500 billion. Can they figure out how to build a lot more value out of what they have today (and get their finances sustainable), before the clock runs out? Or do they get purchased by Meta, Microsoft, etc.
OpenAI has to rapidly roll out the advertising model and get the burn rate down to meaningless levels, so they're no longer dependent on capital markets for financing (that party is going to end suddenly).
Meta is permanently on the outside looking in. They will never field an in-house competitor to GPT or Gemini that can persistently keep up. Meta doesn't know what it is or why it should be trying to compete with GPT/Gemini/Claude. Their failure (at this) is already guaranteed. They should just acquire GPT 4o and let their aging userbase on FB endlessly talk itself into the grave for the next 30 years while clicking ads.
If Amazon knew what they were doing (they don't right now), they would: immediately split retail + ads and AWS. The ad business ensures that the retail business will continue to thrive and would be highly lucrative. Then have AWS purchase Anthropic when valuations drop, bolt it on to AWS everything. Far less of an anti-trust issue than if what is presently known as Amazon attempted it here and now. Anthropic needs to build a lot on to itself to sustain itself and justify its valuation, AWS already has the answer to that.
If valuations plunge, and OpenAI is not yet sustainable, Microsoft should split itself into pieces and have the Windows-Office division purchase OpenAI as their AI option. It'd be their only path to avoiding anti-trust blocking that acquisition. As is Microsoft would not be allowed to buy OpenAI. Alternatively Microsoft can take a shot at acquiring Anthropic at some point - this seems likely given the internal usage going on at Redmond, the primary question is anti-trust (but in this case, Anthropic is viewed as the #3, so Microsoft would argue it bolsters competition with GPT & Gemini).
That would make your solar panel (40kg) around $60K to put into space.
Even being generous and assuming you could get it to $100 per kg that's still $4000
There's a lot of land in the middle of nowhere that is going to be cheaper than sending shit to space.
I think it’s all farce and technically unsound, but I also think that grok-5-elononly is a helluva drug. It’s really got him ready to rally investors behind “spreading the light of consciousness to the universe”. Oh to see the chat logs of their (Elon and his machine girlfriend)’s machinations.
Did you read my comment?
"I have multiple friends in the industry, who have taken a trip through the company."
I am literally referring to extremely successful engineers who have worked directly with Elon.
I'm going to need more than a puff piece on some random Elon stan's medium page to outweigh what I've heard from my friends.
Anti satellite weapons are a thing. Besides, the more vulnerable part becomes you as a person rather than the equipment. There's no space colony yet, and even if there is, the supplies can be easily held hostage by an earthly government too.
1. The only reason there are 15,000 satellites in space is because SpaceX launched about 9,500 of them (Starlink is 65% of all satellites) on their semi-reusable Falcon 9. If fully-reusable Starship pans out, they will be launching satellites at 10x the rate of Falcon 9 at the very least.
2. You don't need to upgrade the satellites, you just launch new ones. The reason data center companies upgrade their servers is because they can't just build a new data center to hold the new chips. But satellites in space are a sunk cost, so just keep using the existing satellites while also launching new ones.
3. Falling solar panel costs decreases the power costs for both earth-based and space-based, but they're more efficient in space so the benefit would be proportionally greater there.
As I said, I'm skeptical too, but let's be skeptical for good reasons.
"Just change the law" ok sure we'll get right on it.
Surely given starlinks 5ish year deorbit plan, you could design a platform to hold up for that long... And instead of burning the whole thing up you could just refurbish it when you swap out the actual rack contents, considering that those probably have an even shorter edge lifespan.
While technically not impossible, the space data center vision appears primarily designed to support SpaceX’s anticipated mid-2026 IPO and justify a $1.5 trillion valuation rather than solve near-term compute constraints.
Perhaps learn to look around the world. Europe has nothing, China is working on copying. New Zealand has RocketLab but looks like they've sold out to the states and is only for small payloads yet.
This isn't quite true. It's very possible that the majority of that power is going into the antennas/lasers which technically means that the energy is being dissipated, but it never became heat in the first place. Also, 5KW solar power likely only means ~3kw of actual electrical consumption (you will over-provision a bit both for when you're behind the earth and also just for safety margin).
These are all things which add weight, complexity and cost.
Propellant transfer to an orbital Starship hasn't even been done yet and that's completely vital to it's intended missions.
And which of those is also an American institution, with American educated employees and American cultural values, operating in an American legal and business framework?
Pretending NZ is a relevant comparison point is laughable. I bet SpaceX is also doing better than the 5th grade STEM class down the street!
Russia would've been a much better comparison given the history of the world we live in, but still not apples to apples.
Those flasks don’t have any space age insulating material - mainly just a vacuum…
Technology from 1892…
This adds weight and complexity and likely also forces a much higher orbit.
https://recommentions.com/elon-musk/books/culture-by-iain-ba...
https://www.vox.com/culture/413502/iain-banks-culture-series...
https://fortune.com/2025/12/15/billionaire-elon-musk-say-tha...
> Musk pointed to The Culture series by Iain M. Banks as his best “imagining” of this world. The science fiction novels depict a utopian future where citizens can have virtually anything they want thanks to AI—making money obsolete and leaving citizens free to spend their time doing whatever they love.
Actually, why not colonize Venus instead? Sure, it will be hard, at first, with all the sulphuric acid and intense heat and whatnot, but we colonized America, so why not Venus?
If the nodes are spinning around the earth at orbital velocities, then all the benefits of physical locality are thrown out the window.
- In the EU, the ASCEND study conducted in 2024 by Thales Alenia Space found that data center in space could be possible by 2035. Data center in space could contribute to the EU's Net-Zero goal by 2050 [1]
- heat dissipation could be greatly enhanced with micro droplet technology, and thereby reducing the required radiator surface area by the factor of 5-10
- data center in space could provide advantages for processing space data, instead of sending them all to earth. - the Lonestar project proved that data storage and edge processing in space (moon, cislunar) is possible.
- A hybrid architecture could dramatically change the heat budget: + optical connections reduce heat + photonic chips (Lightmatter and Q.ANT) + processing-in-memory might reduce energy requirement by 10-50 times
I think the hybrid architecture could provide decisive advantages, especially when designed for AI inference workloads,
On the similar lines, why can't one run a refrigerator in space?
I would be. And granted, I know a lot more about launching satellites than building anything. But it would take me longer to get a satellite in the air than the weeks it will take me to fix a broken shelf in my kitchen. And hyperscalers are connecting in months, not weeks.
The point is that you have been handed a pile of incoherent hog wash, and you are using all the powers at your command to rearrange it into a coherent narrative. It’s like a mental game that some of us cannot help but play. The point is you have to realize you are playing a game, in your head, and even if you can make a beautiful pattern out of the noise, it was still just noise.
Where there is actual meaning in life, its kind of obvious, you dont have to rewrite so much to find it.
For example: quite apart from the fact of how much rocket fuel is it going to take to haul all this shit up there at the kind of scale that would make these space data centres even remotely worthwhile.
I'm not against space travel or space exploration, or putting useful satellites in orbit, or the advancement of science or anything like that - quite the opposite in fact, I love all this stuff. But it has to be for something that matters.
Not for some deranged billionaire's boondoggle that makes no sense. I am so inexpressibly tired of all these guys and their stupid, arrogant, high-handed schemes.
Because rocket fuels are extremely toxic and the environmental impact of pointlessly burning a vast quantity of rocket fuel for something as nonsensical as data centres in space will be appalling.
Yes. These are permitted in weeks for small groups, days for large ones. (In America.)
Permitting is a legitimate variable that weighs in favor of in-space data centers.
I’ve financed two data centers. Most of my time was spent over permitting. If I tracked it minute by minute, it may be 70 to 95%. But broadly speaking, if I had to be told about it before it was solved, it was (a) a real nuisance and (b) not technical.
Think about the stock return over a period - its composed of capital gains and dividends.
Now what happens capital gains disappears and perhaps turns into capital losses? Dividends have to go higher.
What does this mean? Less retained earnings / cashflows that can be re-invested.
Apple is the only one that will come out of this OK. The others will be destroyed for if they dont return cash, the cash balance will be discounted leading to a further reduction in the value of equity. The same thing that happened to Zuckerberg and Meta with the Metaverse fiasco.
Firms in the private sphere will go bust/acquired.
Free space optics are much faster than data to/from the ground. If the training workloads only require high bandwidth between sats, this isn’t a real issue.
Im not convinced on this TBH in the long-run. Google is seemingly a pure play technology firm that has to make products for the sake of it, else the technology is not accessible/usable. Does that mean they are at their core a product firm? Nah. Thats always been Apple's core thing, along side superior marketing.
One only has to compare Google's marketing of the Pixel phone to Apple - it does not come close. Nobody connects with Google's ads, the way they do with Apple. Google has a mountain to climb and has to compensate the user tremendously for switching.
Apple will watch the developments keenly and figure out where they can take advantage of the investments others have made. Hence the partnerships et al with Google.
Elon musk has a history of making improbable-sounding promises (buy a tesla now, by 2018 it will be a self-driving robotaxi earning money while you sleep, humanoid robots, hyperloops).
The majority of these promises have sounded cool enough to enough people that the stock associated with him (TSLA) has made people literal millionaires just by holding onto the stock, and more and more people have bought in and thus have a financial interest in Musk's ventures being seen in a good light (since TSLA stock does not go up or down based on tesla's performance, it goes up or down based on the vibes of elon musk. It is not a car company stock, it is an elon vibes check).
The thing he's saying now pattern matches to be pretty similar, and so given Musk's goal is to gain money, and he gains money by TSLA and SpaceX stock going up, this makes perfect sense as a thing to say and even make minor motions towards in order to make him richer.
People will support it too since it pattern matches with the thing prior TSLA holders got rich off of, and so people will want to keep the musk vibes high so that their own $tsla holdings go to the moon.
Make sense now?
We have a record high population, healthier and richer than ever.
Maybe the AI workloads running on it achieve escape velocity? ;)
I suspect this is really the fundamental idea behind this whole plan.
But more abstractly, it's our resources that are being allocated. The planet as a unit is deciding where to put it's effort. Apparently we're not very good at this
Downtown Los Angeles: The One Wilshire building, which is the worlds most connected building. There are over twenty floors of data centers. I used Corporate Colo which was a block or two away. That building had at least 10 floors of Data Centers.
Aside from the point others have made that 50 MW is small in the context of hyperscalers, if you want to do things like SOTA LLM training, you can't feasibly do it with large numbers of small devices.
Density is key because of latency - you need the nodes to be in close physical proximity to communicate with each other at very high speeds.
For training an LLM, you're ideally going to want individual satellites with power delivery on the order of at least about 20 MW, and that's just for training previous-generation SOTA models. That's nearly 5,000 times more power than a single current Starlink satellite, and nearly 300 times that of the ISS.
You'd need radiator areas in the range of tens of thousands of square meters to handle that. Is it theoretically technically possible? Sure. But it's a long-term project, the kind of thing that Musk will say takes "5 years" that will actually take many decades. And making it economically viable is another story - the OP article points out other issues with that, such as handling hardware upgrades. Starlink's current model relies on many cheap satellites - the equation changes when each one is going to be very, very expensive, large, and difficult to deploy.
Datacenters in space is ambiguous enough to mean on lunar soil which provides plenty of heat dissipation using geothermal heat pumps.
Similarly mass to orbit is also less problematic if silicon factories (including the refineries) are built on lunar soil as well.
press x to doubt
> on 21 February 2008, the US Navy destroyed USA-193 in Operation Burnt Frost, using a ship-fired RIM-161 Standard Missile 3 about 247 km (153 mi) above the Pacific Ocean.
No company has ever made an investment in something that ended up being more expensive than calculated, or so expensive it bankrupted them.
They're losing money now because they're making massive bets on future capacity needs. If those bets are wrong, they're going to be in very big trouble when demand levels off lower than expected. But that's not the same as demand being zero.
What starship? The fantasy rocket Musk has been promising for 10 years or the real one that has thus far delivered only one banana worth of payload into orbit?
This is not how corporate finance works. Capital gains and losses apply to assets. And only the most disciplined companies boost dividends in the face of decline—most double down and try to spend their way back to greatness.
That is exactly what you do - just like with Starlink - toss out the panels with attached GPUs, laser transmitter and small ion drive.
https://www.nasa.gov/smallsat-institute/sst-soa/thermal-cont...
But I really hope posts like this don't discourage whoever is investing in this. The problems are solvable, and someone is trying to solve them, that's all that matters. My only concern is the latency, but starlink seems to manage somehow.
Also, a matter of technicality (or so I've heard it said) is that the earth itself doesn't dissipate heat, it transforms or transfers entropy.
1) Water scarcity and energy scarcity here on earth
2) It will drive down launch costs and promotes investment in orbital facilities and launch capabilities.
those two reasons alone are enough.
Even this isn't true. It's ~120 degC in daylight in LEO. It only gets cold in the shade, but a solar powered data center is pretty useless in the shade.
I don’t remember the difference from my science classes, isn’t This the same thing essentially?
Intentionally causing Kessler Syndrome?
> A hybrid architecture could dramatically change the heat budget: + optical connections reduce heat + photonic chips (Lightmatter and Q.ANT) + processing-in-memory might reduce energy requirement by 10-50 times
It would also make ground-based computation more efficient by the same amount. That does nothing to make space datacenters make sense.
Why would they need to get data back to earth for near real time workloads? What we should be thinking about is how these things will operate in space and communicate with each other and whoever else is in space. The Earth is just ancient history
Note that on modern hardware cosmic rays permanently disable circuits, not mere bitflips.
In deep space (no incident power) you need roughly 2000 sq meters of surface area per megawatt if you want to keep it at 40C. That would mean your 100 MW deep space datacenter (a small datacenter by AI standards) needs 200000 sq meters of surface area to dissipate your heat. That is a flat panel that has a side length of 300 meters (you radiate on both sides).
Unfortunately, you also need to get that power from the sun, and that will take a square with a 500 meter side length. That solar panel is only about 30% efficient, so it needs a heatsink for the 70% of incident power that becomes heat. That heatsink is another radiator. It turns out, we need to radiate a total of ~350 MW of heat to compute with 100 MW, giving a total heatsink side length of a bit under 600 meters.
All in, separate from the computers and assuming no losses from there, you need a 500x500 meter solar panel and a 600x600 meter radiator just for power and heat management on a relatively small compute cluster.
This sounds small compared to things built on Earth, but it's huge compared to anything that has been sent to space before. The ISS is about 100 meters across and about 30 meters wide for comparison.
So it's dark 50% of the time on the moon... just like here on Earth.
But now looking back and accounting for the claims he made there's a pattern.
I saw this article:
https://www.wired.com/story/theres-a-very-simple-pattern-to-...
that said... he did jumpstart the EV industry. He has put up satellites every week for years. He is still a net benefit to all of us.
Then you get people paying much more money to use less-tightly-moderated space-based AI rather than heavily moderated AI.
https://spectrum.ieee.org/underground-nuclear-reactor-deep-f...
Space is not cold or hot - it isn't. It's a vacuum. Vacuum has no temperature, but objects in space reach temperatures set by radiative balance with their environment. This makes it difficult to get rid of heat. On earth heat can be dumped through phase change and discharged (evaporation), or convection or any number of other ways. In space the only way to get rid of heat is to radiate it away.
Superconductors don't have any resistance - and so heating from resistance isn't present. However, no super conducting computers have been created.
https://en.wikipedia.org/wiki/Superconducting_computing
And yes, it is really impressive - but we're also talking about one chip in liquid helium on earth. One can speculate about the "what if we had..." but we don't. If you want to make up technologies I would suggest becoming a speculative fiction author.
Heating of the spacecraft would get it on the warm side.
https://www.amu.apus.edu/area-of-study/science/resources/why...
> The same variations in temperature are observed in closer orbit around the Earth, such as at the altitudes that the International Space Station (ISS) occupies. Temperatures at the ISS range between 250° F in direct sunlight and -250° F in opposition to the Sun.
> You might be surprised to learn that the average temperature outside the ISS is a mild 50° F or so. This average temperature is above the halfway point between the two temperature extremes because objects in orbit obviously spend more time in partial sunlight exposure than in complete opposition to the Sun.
> The wild fluctuations of 500° F around the ISS are due to the fact that there is no insulation in space to regulate temperature changes. By contrast, temperatures on Earth’s surface don’t fluctuate more than a few degrees between day and night. Fortunately, we have an atmosphere and an ozone layer to insulate the Earth, protect it from the Sun’s most powerful radiation and maintain relatively consistent temperatures.
If you want solar power, you've got to deal with the 250 °F (121 °C). This is far beyond the specification for super conducting materials. For that matter, even -250 °F (-156 °C = 116 K) is much warmer than the super conducting chip range of 10 K.
Furthermore, the cryogenic material boils off in space quite significantly (I would suggest reading https://en.wikipedia.org/wiki/Orbital_propellant_depot#LEO_d... or https://spacexstock.com/orbital-refueling-bottlenecks-what-i... "Even minor heat exposure can cause fuel to boil off, increasing tank pressure and leading to fuel loss. Currently, the technology for keeping cryogenic fuels stable in space is limited to about 14 hours.") You are going to have significant problems trying to keep things at super conducting temperatures for a day, much less a month or a year.
Even assuming that you can make a computer capable of doing AI training using super computers this decade (or even the next) ... zero resistance in the wire is not zero power consumption. That power consumption is again heat.
---
> Theoretically you could manufacture a lot of the electricity conducting medium out of a superconductor.
Theoretically you can do whatever you want and run it on nuclear fusion. Practically, the technologies that you are describing are not things that are viable on earth, much less to try to ship a ton of liquid helium into space (that's even harder than shipping a ton of liquid hydrogen - especially since harvesting it is non-trivial).
---
Computing creates heat. Maxwell's demon taught us that doing 1 & 1 and getting one creates heat. Every bit of computation creates heat - superconductor or no. This is an inescapable fact of classical computation. "Ahh," you say " - but you can do quantum computation"... and yes, it may work... and if you can get a quantum computer with a kilobit of qbits into space, I will be very impressed.
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One of the things that damages superconductors is radiation. On earth we've got a nice atmosphere blocking the worst of it. Chips in space tend to be radiation hardened. The JWST is using a BAE RAD750. The 750 should be something that rings a bell in the mind of people... its a PPC 750 - the type in a Macintosh G3... running between 110 and 200 Mhz (that is not a typo, it is not Ghz but Mhz).
High temperature super conductors (we're not dealing with the 10 kelvin but rather about 80 kelvin (still colder than -250 °F) are very sensitive to damage to their lattice. As they accumulate damage they become less superconductive and that causes problems when you've got a resistor heating up in the cryogenic computer.
---
Your descriptions of the technology for superconducting computers is in the lab, at best decades from being something resembling science fact (much less a fact that you can lift into space).
Even for a simple sphere, if we give it different surface roughnesses on the sun-facing side and the "night" side, it can have dramatically different emissivity.
You put the cold side of the phase change on the internal cooling loop, step up the external cooling loop as high temp as you can and then circulate that through the radiators. You might even do this step up more than once.
Imagine the data center like a box, you want it to be cold inside, and there’s a compressor, you use to transfer heat from inside to outside, the outside gets hot, inside cold. You then put a radiator on the back of the box and radiate the heat to the darkness of space.
This is all very dependent on the biggest and cheapest rockets in the world but it’s a tradeoff of convenience and serviceability for unlimited free energy.
Talk to any former SpaceX or Tesla employee. They will clue you in that both were successful in spite of Elon, not because of him.
The Cybertruck was really the first product he saw to completion from his own design. And well...
Is that possible in our lifetime? I'd be optimistic about that. Can SpaceX pull that off? Space what? ...
At the same time, it'd give the country controlling it so much economic, political and military power that it becomes impossible to challenge.
I find that all to be a bit of a stretch, but I think that's roughly what people talking about "the AI race" have in mind.
No, he's not. Dragon is using CotS, non rad-hardened CPUs. And it's rated to carry humans to space.
> AWST: So, NASA does not require SpaceX to use radiation-hardened computer systems on the Dragon?
John Muratore: No, as a matter of fact NASA doesn't require it on their own systems, either. I spent 30 years at NASA and in the Air Force doing this kind of work. My last job was chief engineer of the shuttle program at NASA, and before that as shuttle flight director. I managed flight programs and built the mission control center that we use there today.
On the space station, some areas are using rad-hardened parts and other parts use COTS parts. Most of the control of the space station occurs through laptop computers which are not radiation hardened.
> Q: So, these flight computers on Dragon – there are three on board, and that's for redundancy?
A: There are actually six computers. They operate in pairs, so there are three computer units, each of which have two computers checking on each other. The reason we have three is when operating in proximity of ISS, we have to always have two computer strings voting on something on critical actions. We have three so we can tolerate a failure and still have two voting on each other. And that has nothing to do with radiation, that has to do with ensuring that we're safe when we're flying our vehicle in the proximity of the space station.
I went into the lab earlier today, and we have 18 different processing units with computers in them. We have three main computers, but 18 units that have a computer of some kind, and all of them are triple computers – everything is three processors. So we have like 54 processors on the spacecraft. It's a highly distributed design and very fault-tolerant and very robust.
[1] - https://aviationweek.com/dragons-radiation-tolerant-design
I think I've also seen someone mention that the cost and power benefit of substituting rad-hard chips with garden variety wean off fast once the level of redundancy goes up, and also it can't handle deep space radiations that just kill Earthbound chips rather than partially glitching them.
gemini says that the NVIDIA DGX H100 is 130kg and takes 11kW.
It says space-based radiators in the 100kW range are approx 15kg per kW. And space-based solar panels are approx 1kg per kW.
So let's says we're talking about 1 system that bundles 9 DGX H100's. That's 1.2T for the computing system, 1.5T for the radiator, 100kg for the solar panels, and let's say 2T for the propulsion, propellant, guidance, and all the other spacecraft stuff. That's a total of about 5T, and the radiator is just about 20% of the mass budget.
The power radiated is proportional to the 4th power of the temperature, so they would be incentivized to develop a heat exchanger with a high temperature working fluid.
0. https://www.arccompute.io/solutions/hardware/gpu-servers/sup...
Just admit it was hyperbole.
The regulatory framework is getting more and more difficult for data centers.
The options are move to countries with less of an uphill regulatory burden (UAE?), but this comes with other issues.
Space it is.
The short answer is that ~100m2 of steel plate at 1400C (just below its melting point) will shed 50MW of power in black body radiation.
I’d even bet that when they do IPO, there will be ZERO mention of “space data centres” in the prospectus!
If you had a thermometer that had no heat generation then yes.
If you have a resistor or other heat generating circuit then you need to have the needed surface area to radiate the heat away. If you don't, it will heat up. It's a rate problem.
... if you completely ignore the difficulty of getting them up there. I'd be interested to see a comparison between the amount of energy required to get a solar panel into space, and the amount of energy it produces during its lifetime there. I wouldn't be surprised if it were a net negative; getting mass into orbit requires a tremendous amount of energy, and putting it there with a rocket is not an efficient process.
Note that KSP is a game that fictionalizes a lot of things, and sizes of solar panels and radiators are one of those things.
100 years later: "why does everything taste like cadmium?"
with the GPU costing the same, it would only double the capex.
>Even being generous and assuming you could get it to $100 per kg that's still $4000
noise compare to the main cost - GPUs.
>There's a lot of land in the middle of nowhere that is going to be cheaper than sending shit to space.
Cheapness of location of your major investment - GPUs - may as well happen to be secondary to other considerations - power/cooling capacity stable availability, jurisdiction, etc.
Heat pumps are magic. They're something like 300% efficient. Each watt generates 3 watts of useful heat.
> or the real one that has thus far delivered only one banana worth of payload into orbit?
once it starts delivering real payloads, the time for discussions will be no more, it will be time to rush to book your payload slot.
What is this figure based on?
SpaceX: "we're going to put datacenters in space"
HN comments: "obviously we'll need to move human civilization into space first for this to make sense. checks out."
That is the goal of Starship though. The ISS has a mass of 400 ton, the goal is to need only two cheap launches of Starship v4 for that.
Imo I would be extremely angry if I owned any spacex equity. At least nvidia might be selling to china in the short term... what's the upside for spacex?
Also why talk about training not inference? That needs data centers too and could be what they're intending to do.
So this post is clearly not an effort to objectively work out the feasibility but just a biased list of excuses to support the author's unsubstantiated opinion.
If they get 3/10 things right, and 60 Minutes highlights those in the next interview, they’re set!
You meet this with "well, once it works, it'll be amazing and you'll be queuing up"? How very very musky!
What a cult.
5kg, 500W panel (don’t exactly know what the ratio is for a panel plus protection and frame for space, might be a few times better than this)
Say it produces about 350kWh per month before losses.
Mass to LEO is something like 10x the weight in fuel alone, so that’s going to be maybe 500kWh. Plus cryogenics etc.
So not actually that bad
I wonder if you were thinking about muh emissions for a chemical rocket launched piece of machinery containing many toxic metals to be burnt up in the air in 3-5 years... It doesn't sound more environmentally friendly.
T^4 is not exponential in T, it’s polynomial. For exponential, T must be in the exponent, e.g. 2^T or so.
Still, pretty effective.
Having said that, agree that Elon is full of it.
Where is the tech?
Those are not independent facts. They put the hardware inside, behind the radiation shielding they use to keep the astronauts safe. It's why regular old IBM laptops work on the Space Station too. That kind of shielding is going to blow your mass budget if you use it on these satellites.
SpaceX, which prefers COTS components when it can use them, still went with AMD Versal chips for Starlink. Because that kind of high performance, small process node hardware doesn't last long in space otherwise (phone SoC-based cubesats in LEO never lasted more than a year, and often only a month or so).
Second, are you saying that we basically need to have a radiator as big (approximately) as the solar panels?
That is a lot, but it does sound manageable, in the sense that it approximately doubles what we require anyway for power.
So, not saying that it’s easy or feasible, but saying that cooling then seems “just” as difficult as power, not insurmountably more difficult. (Note that the article lists cooling, radiation, latency, and launch costs as known hard problems, but not power.)
And btw Kessler syndrome applies to any orbital band. You've got the logic backwards. Kessler syndrome is usually only considered a threat for LEO because that's where most of the satellites are. But if you're throwing million(s) of satellites into orbit, it becomes an issue at whatever orbital height you pick.
Ionizing radiation disrupts the crystalline structure of the semiconductor and makes performance worse over time.
High energy protons randomly flip bits, can cause latchup, single event gate rupture, destroy hardware immediately, etc.
At the end of the day I don't really care either way. It ain't my money, and their money isn't going to get back into the economy by sitting in a brokerage portfolio. To get them to spend money this is as good a way as any other, I guess. At least it helps fund a little spaceflight and satellite R&D on the way.
The known scammer guy? Like these ideas wouldn't pass the questions at the end of a primary school presentation.
This is BS, everyone knows that this is BS, but because this is Elon, there are still people who don't call out the BS.
It might be distraction, he might be delusional, he might be asking his investors to stop asking for profit by giving them shares from SpaceX, but this is not him discovering new physics.
And yet journalists at major institutions have been repeating Musk's claims with very little skepticism ("xAI and SpaceX are merging to bring data centers to space").
Making a dent into making humans a multiplanetary species requires making a lot of companion species as well; the task requires much more elementary stuff (relative to the mission), at the ground level, than Musk is demonstrating to do (at technical, entrepreneurial and political level).
This is a con, from the start. It just worked so far so some people fall for it.
"More efficient cooling architecture taking advantage of higher ΔT in space"
My bold claim: The cost of cooling will not be $0. The cost of launching that cooling into space will also not be $0. The cost of maintaining that mechanically complex cooling in space will not be $0.
They then throw in enough unrealistic calculations later in the "paper" to show that they thought about the actual cost at least a little bit. Apparently just enough to conclude that it's so massive there's no way they're going to list it in the table. Table 1 is pure fantasy.
I will not re-read them, but from what I recall from those threads is numbers don't make sense. Something like:
- radiators the multiple square kilometers in size, in space;
- lifting necessary payloads to space is multiples of magnitudes more than we have technology/capacity as the whole world now;
- maintanence nightmare. yeah you can have redundancy, but no feasable way to maintain;
- compare how much effort/energy/maintenance is required to have ISS or Tiangong space stations - these space datacenters sound ridiculous;
NB: I would be happy to be proven wrong. There are many things that are possible if we would invest effort (and money) into it, akin to JFK's "We choose to go to the Moon" talk. Sounded incredible, but it was done from nearly zero to Moon landing in ~7 years. Though as much as I udnerstand - napkin math for such scale of space data centers seem to need efforts that are orders or magnitude more than Apollo mission, i.e. launching Saturn V for years multiple times per day. Even with booster reuse technology this seems literally incredible (not to mention fuel/material costs).
"SmartIR’s graphene-based radiator launches on SpaceX Falcon 9" [1]. This could be the magic behind this bet on heat radiation through exotic material. Lot of blog posts say impossible, expensive, stock pump, etc. Could this be the underlying technology breakthrough? Along with avoiding complex self-assembly in space through decentralization (1 million AI constellation, laser-grid comms).
[1] https://www.graphene-info.com/smartir-s-graphene-based-radia...
I don't know of an instance of this happening successfully.
This is only relevant to the compute productivity (how much useful work it can produce), but it's irrelevant to the heat dissipation problem. The energy income is fundamentally limited by the solar facing area (x 1361 W/m^2). So the energy output cannot exceed it, regardless useful signals or just waste heat. Even if we just put a stone there, the equilibrium temperature wouldn't be any better or worse.
Every DC I’ve been in (probably around 20 in total) has been multi storey.
His plan here clearly hinges around using robots to create a fully-automated GPU manufacturing and launch facility on the moon. Not launching any meaningful number from earth.
Raises some big questions about whether there are actually sufficient materials for GPU manufacture on the moon... But, whatever the case, the current pitch of earth-launches that the people involved with this "space datacenter" thing are making is a lie. I think it just sounds better than outright saying "we're going to build a self-replicating robot factory on the moon", and we are in the age of lying.
(I'm ignoring installation costs etc. because actually creating the satellites is ignored here, too)
Of course that didn't work out with this specific acquisition, but overall it's at least a somewhat reasonable idea.
Unfortunately no. The arctic region is too cold and humid. You need way more energy to manage the cooling of a datacenter there than somewhere hotter.
- SpaceX just requested a license to launch up to a million satellites.
- the satellites already have some incredible anti collision software, which I believe Elon has now open sourced.
- the cost to launch 1 kg to space has dropped by a factor of 10 in the past few years and is currently less than $1000. It's perfectly reasonable to estimate that over the next 10 years the cost could drop by another factor of 10, if not more, particularly if the heavy rockets are reusable.
1. https://techcrunch.com/2026/01/31/spacex-seeks-federal-appro...
2. https://starlink.com/updates/stargaze
3. https://www.netizen.page/2025/05/cost-per-kilogram-to-low-ea...
Edit: added item 3
Yes, only doubling the capex. With the benefits of, hmm, no maintenance access and awful networking?
This is widely believed (especially in the US, where, other than the Leaf, most early electric cars never launched), but honestly pretty dubious. The first real electric cars, with significant production:
2010 - Mitsubishi i-MiEV, Nissan Leaf
2011 - Smart electric, Volvo C30 electric, Ford Focus electric, BYD e6.
2012 - Renault Zoe (Renault launched a couple of other vehicles on the same platform ~2010, but they never saw significant production), Tesla Model S (Tesla had a prior car, the Roadster, but it never saw significant production).
2013 - VW eUP, eGolf (VW occasionally put out an electric Golf historically, going back to 1992, but again those were never produced in large quantities).
The big change ~2010 was around the economics of lithium ion batteries; they finally got cheap enough that everyone started pulling their concept designs and small-scale demonstration models into full production.
Not necessarily. There are many modern thermos "cups" that are just a regular cup, except with two layers of glass and a vacuum. Even the top is open all the time. (e.g. https://www.ikea.com/us/en/p/passerad-double-wall-glass-8054... )
It's still good enough to keep your coffee hot for an entire day.
While personally I think it's another AI cash grab and he just wants to find some more customers for spacex, other thing is "you can't copyright infringe in space" so it might be perfect place to load that terabytes of stolen copyrighted material to train data sets, if some country suddenly decides corporation stealing copyright content is not okay any more
That's why Lumen/Starcloud's designs all assume it'll be a space station with all containers connected to one central networking spine.
Which is exactly how you'd do a hypothetical dc in space. Come on, you're arguing for the sake of arguing. CotS works. This is not an issue.
> That kind of shielding is going to blow your mass budget
SpX is already leading in upmass by a large margin. Starship improves mass to orbit. Again, this is a "solved" issue.
There are other problems in building space DCs. Rad hardening is not one of them. AI training is so fault tolerant already that this was never an issue.
> 1. every gram you need to send to space is costly, a issue you don't have at ground level
This is a one time cost. Maybe the running costs are cheap enough to offset this.
> 2. cooling is a catastrophe, sure space is cold, but also a vacuum, so the cooling rate is roughly the infrared radiation rate. This means if you are not careful with the surface of a satellite it can end up being very slowly cooked by sunlight alone not including running any higher heat producing component (as it absorbs more heat from sunlight then it emits, there is a reason satellites are mostly white, silver or reflective gold in color). Sure better surface materials fix that, but not to a point where you would want to run any heavy compute on it.
I would assume the people designing this are "very careful" with everything they put in the data center. If achieving the cooling is only very hard and requires careful material engineering, then it can be worked out and they will get it done. If it is impossible, then this will not happen, but I'm a physicist myself and I can't tell without a very involved analysis whether it is impossible or not to get enough cooling power for this in space, considering all, possibly ingenious ways to engineer the surfaces of the data center to dissipate a maximum amount of heat.
> 3. zero repair-ability, most long running satellites have a lot of redundancy. Also at least if you are bulk buying Nvidea GPGPUs on single digit Million Euro basis it's not rare that 30% have some level of defect. Not necessary "fully broken" but "performs less good then it should/compared to other units" kind of broken.
I suppose they could make something like the International Space Station, which would get regular traffic back-and-forth exchanging and servicing hardware as needed.
> 4. radiation/solar wind protections are a huge problem. Heck even if you run things on earth it's a problem as long as your operations scale is large enough. In space things are magnitudes worse.
Again, it's not a question whether this is "problematic"; everything about putting data centers in space is. The question is whether, with huge amount of work and resources, they can engineer a solution to overcome this. If they can, it's again a one time cost for the data center that might be offset by the running costs of the facility.
> 5. every rocket lunch causes atmospheric damage, so does every satellite evaporating on re-entry. That wasn't that relevant in the past, but might become a problem just for keeping stuff like Starlink running. We don't need to make it worse by putting datacenters into space.
> 6. Kessler Syndrom is real and could seriously hurt humanity as a whole, no reason to make it much more likely by putting things into space which don't need to go there.
These are collective problems for the whole of humanity and will not concern an individual actor such as Elon Musk who wants to send more satellites into space.
Current satellites get around 150W/kg from solar panels. Cost of launching 1kg to space is ~$2000. So we're at $13.3(3)/Watt. We need to double it because same amount need to be dissipated so let's round it to $27
One NVidia GB200 rack is ~120kW. To just power it, you need to send $3 240 000 worth of payload into space. Then you need to send additional $3 106 000 (rack of them is 1553kg) worth of servers. Plus some extra for piping
Current satellites get around 150W/kg from solar panels. Cost of launching 1kg to space is ~$2000, so we're at $13.3(3)/Watt, that just power, let's assume that cooling will cost us same per kg, the same amount need to be dissipated so let's round it to $27
One NVidia GB200 rack is ~120kW. To just power it, you need to send $3 240 000 worth of payload into space. Then you need to send additional $3 106 000 (rack of them is 1553kg) worth of servers. Plus some extra for piping. We're already at $6.3 mil a pop for just hauling it up to orbit, with no cost of solar cells included
I'd imagine comparable hardware for just some solar + batteries on ground is around $200k. I dunno where the repeated 5x cost number comes from. I suspect whoever pushed it was just lying
However one flaw in this critique is that is only looks at the cost of ground-based solar panels and not their overall scalability. That is, manufacturing cost is far from the only factor. There is also the need for real estate in areas with good sun exposure that also have sufficient fresh water supply for cleaning.
When we really consider the challenges of deploying orders of magnitude more terrestrial solar, it really requires a more detailed and specific critique of the orbital vision. Positive includes near continuous solar exposure (in certain orbits) and no water requirements.
Much has been said of cooling but remember, there is a lot of literal space between the satellites for radiative cooling fins. It is envisioned they would network via optical links, and each mini satellite would be roughly on the order of a desktop GPU (not a whole data center rack). The vision is predicated on leveraging a ton of space for lots of mini satellites on the order of a Dell desktop tower. The terrestrial areas that are really cold are also not that great for solar exposure.
Personally I don't know how it will play out but the core concern I have about making these kinds of absolutist predictions is they make weak assumptions about the sustainable scalability of terrestrial power. And that is definitely the case here in that it only looks at the manufacturing cost of solar.
Just shoot it into space where it's all inaccessible and will burn out within 5 years, forcing a continuous replacement scheme and steady contracts with Nvidia and the like to deliver the next generation at the exact same scale, forever
I too don't think it's currently a sensible solution. But the author completely unable to make a proper case. For instance, just to refute that one claim, there are many reasons to do it in space even at an cost.
Space-based data centers provide an off-world backup that is immune to Earth-specific disasters like earthquakes, floods, fires, or grid collapses. Servers in orbit are physically isolated from terrestrial threats, making them safe from riots, local warfare, or physical break-ins.
Moving infrastructure to space solves local community disputes by removing the strain on residential power grids and freeing up land for housing or nature. Space data centers do not deplete Earth’s freshwater supply for cooling, unlike terrestrial centers which consume billions of gallons annually.
Solar panels in orbit can access high-intensity sunlight 24 hours a day without interference from clouds, night, or the atmosphere.
Data stored in space can exist outside of national borders, protecting it from seizure, censorship, or the legal jurisdiction of unstable governments. Data transmission can be faster in space because light travels roughly 30% faster in a vacuum than it does through fiber optic cables.
Processing data directly in orbit is necessary for satellites and future space stations to avoid the delay and cost of beaming raw data back to Earth
The energy demand of these DCs is monstrous, I seriously can't imagine something similar being deployed in orbit...
What (literally) on earth makes you say this? The arctic has excellent cooling and extremely poor sun exposure. Where would the energy come from?
A satellite in sun-synchronous orbit would have approximately 3-5X more energy generation than a terrestrial solar panel in the arctic. Additionally anything terrestrial needs maintenance for e.g. clearing dust and snow off of the panels (a major concern in deserts which would otherwise seem to be ideal locations).
There are so many more considerations that go into terrestrial generation. This is not to deny the criticism of orbital panels, but rather to encourage a real and apolitical engineering discussion.
Solar panels are 20x more efficient than growing corn for ethanol. Swap out some of those 30 million acres of ethanol corn fields (in the US) and you'll have more energy than you need.
More details here: https://www.youtube.com/watch?v=KtQ9nt2ZeGM
That doesn't mean you need a gigawatt of power before achieving anything useful. For training, maybe, but not for inference which scales horizontally.
With satellites you need an orbital slot and launch time, and I honestly don't know how hard it is to get those, but space is pretty big and the only reasons for denying them would be safety. Once those are obtained done you can make satellite inferencing cubes in a factory and just keep launching them on a cadence.
I also strongly suspect, given some background reading, that radiator tech is very far from optimized. Most stuff we put into space so far just doesn't have big cooling needs, so there wasn't a market for advanced space radiator tech. If now there is, there's probably a lot of low hanging fruit (droplet radiators maybe).
What matters is that investors and shareholders love to hear about future space data centers.
Obligatory /s.
What about gamma rays? there is a reason why "space hardened" microcontrollers are MIPS chips from the 90s on massive dies with a huge wedge of metal on it. You can't just take a normal 4micron die and yeet it into space and have done with it.
Then there is the downlink. If you want low latency, then you need to be in Low earth orbit. That means that you'll spend >40% of your time in darkness. So not only do you need to have a MAssive heat exchanger and liquid cooling loop, which is space rated, you need to have ?20mwhr of battery as well (also cooled/heated because swinging +/- 140 C every 90 minutes is not going to make them happy)
Then there is data consistency, is this inference only? or are we expecting to have a mesh network that can do whole "datacentre" cache coherence? because I have bad news for you if you're going to try that.
Its just complete and total bollocks.
utter utter bollocks.
The author forgot to add that this is only true from the perspective of their own bias.
To someone else it might make a lot of sense, e.g. someone who expects militant resistance to the "data centers" from the general public or some other actor that is highly unlikely to achieve space capabilities.
Because the first company to have a full functioning AGI will most likely be the most valuable in the world. So it is worth all the effort to be the first.
I think the main reason to host them in space is to escape Earth jurisdictions, but even that is dubious as there will be people involved that reside on the Earth.
A quick search gave me a lifespan of around 5 years for a starlink satellite.
If you put in orbit a steady stream of new satellites every year maintenance is not an issue, you just stop using worn out or broken ones.
Solar roof tiles: makes no sense
Lot's of tiny tunnels under cities: makes no sense
Performance of the new roadster: makes no sense
All four of the above were likely scams. Musk is not beyond running a scam.
You also underestimate the cooling problem. The fact that space is cold doesn’t mean it’s easy to cool things off in space. On earth the main cooling strategy is to transfer heat through direct contact and move the hot stuff away. Be it air or water, as you mentioned. In space your only option is to radiate heat away. And that’s while half of you is under intense sunlight.
I think you also undersell the thread of warfare in space. Sure, a guy with Molotov can’t get you space data center but we’ve had satellite shot down. So maybe not every war is a threat but, say China or Russia (or other space-faring nation) could take care of a satellite if absolutely needed.
National seizures are also still a threat. If only being outside national borders was such a great defense we’d see some data centers in the sea by now.
So being in space is immune to some of the known problems but also comes with a whole lot of novel issues, not solved at scale yet. And so far I haven’t seen any sufficiently detailed proposed solutions to even consider the trade of known problems with readily available solutions for new issues with lots of unknowns.
Also people made fun of tesla that it will never be able to compete with the big carmakers. Now I would rather have some stocks in tesla than holding on to volkswagen.
1. Solving cost of launching mass has been the entire premise of SpaceX since day one and they have the track record.
2. Ingress/egress aren't at all bottlenecks for inferencing. The bytes you get before you max out a context window are trivial, especially after compression. If you're thinking about latency, chat latencies are already quite high and there's going to be plenty of non-latency sensitive workloads in future (think coding agents left running for hours on their own inside sandboxes).
3. This could be an issue, but inferencing can be tolerant to errors as it's already non-deterministic and models can 'recover' from bad tokens if there aren't too many of them. If you do immersion cooling then the coolant will protect the chips from radiation as well.
4. There is probably plenty of scope to optimize space radiators. It was never a priority until now and is "just" an engineering problem.
5. What mass manufacture? Energy production for AI datacenters is currently bottlenecked on Siemens and others refusing to ramp up production of combined cycle gas turbines. They're converting old jet engines into power plants to work around this bottleneck. Ground solar is simply not being considered by anyone in the industry because even at AI spending levels they can't store enough power in batteries to ride out the night or low power cloudy days. That's not an issue in space where the huge amount of Chinese PV overproduction can be used 24/7.
They might be closer to collapsing than most people think. It's not unheard of that a billionaires net worth drops to zero over night.
I think it's mostly financial reasons why they merged the companies, this space datacenter idea was born to justify the merge of SpaceX and xAI. To give investors hope, not to really do it.
Asside from the other excellent comments on power consumption, cooling and radiation. One point I didn't see being made in the comments much is maintenance costs.
Now I don't find myself in the facility of a data center often in daily life, however I do know that medium to big data centers require 24/7 hardware replacement. I believe this is what those 5 guys with the bikes and scooters are doing in every data center. That would be very difficult, near impossible in space (with the current space fairing infrastructure).
I would assume such a setup involves multiple stages of heat pumps to from GPU to 1400C radiatoe. Obviously that's going to impact efficiency.
Also I'm not seriously suggesting that 1400C radiators is a reasonable approach to cooling a space data centre. It's just intended to demonstrate how infeasible the idea is.
BUT the fact that we are even arguing about whether or not we should be putting data centers into space is so incredibly absurd to someone who watched the Challenger explode and assumed that space wouldn't be ventured into again in my lifetime.
People don't realize how much the priors have changed. Take a minute to appreciate that. We are living in a world where people are debating if it makes sense to spend a bazillion dollars to put a hard disk into orbit.
I wonder if the Klingons are good at cyber warfare.
Building 3-5x more solar plants in the Arctic, would still be cheaper than travelling to space. And that's ignoring that there are other, more efficient plants possible. Even just building a long powerline around the globe to fetch it from warmer regions would be cheaper.
Or you float them on the ocean circumnavigating the earth?
Or we put the datacenters on giant Zeppelins orbiting above the clouds?
If we are doing fantasy tech solutions to space problems, why not for a million other more sensible options?
Hillary (he features on the NZ Five Dollar note) was one of those guys who does things for no good reason. He also went to both poles. This only tells us that it is indeed possible, but not that it's desirable or will become routine.
This is while they try to find a solution to earn money with it.
Starship launch costs have a $100/kg goal, so we'd be at $40 / kW, or $4800 for a 120kW cluster.
120kW is 1GWh annually, costs you around $130k in Europe per year to operate. ROI 14 days. Even if launch costs aren't that low in the beginning and there's a lot more stuff to send up, your ROI might be a year or so, which is still good.
[1] - https://www.polytechnique-insights.com/en/columns/space/ultr... [2] - https://space.stackexchange.com/questions/12824/lightest-pos...
ISS radiators are huge 13.6x3.1 m. Each radiates 35 kW. So you need 3 of them to have your 100 kW target. They are also filled with gas that needs pumping so not exactly a passive system and as such can break down for a whole lot of reasons.
You also need to collect that power so you need about the same amount of power coming from solar panels. ISS solar array wings are 35x12 m and can generate about 31 kW of power. So we’ll need at least 3 of them. BTW each weighs a ton, a literal metric ton.
It hardly seems feasible. Huge infrastructure costs for small AI server rooms in space.
These companies wanted to merge for financial reasons and the invented reason is nonsensical. We shouldn't even give the nonsensical reason the benefit of trying to make sense of it.
You'd be wrong. There's a huge incentive to optimized radiator tech because of things like the international space station and MIR. It's a huge part of the deployment due to life having pretty narrow thermal bands. The added cost to deploy that tech also incentivizes hyper optimization.
Making bigger structures doesn't make that problem easier.
Fun fact, heat pipes were invented by NASA in the 60s to help address this very problem.
Apart of that, I do agree that space data centers are probably just a marketing stunt at this point, although some things could obviously be done to increase their chances, like more lightweight designs on GPUs, something that was never a big topic before.
Air itself is an isolator, there is a reason you need to shove in fresh air to take on more energy from the heat source.
Starship development is consuming billions. F9 & Starlink are probably profitable ?
I’d say this is more shifting of the future burden of xAI to one of his companies he knows will be a hit stonk when it goes public, where enthusiasm is unlikely to be dampened by another massive cash drain on the books.
To me it looks like the next Musk’s grift. Remember Mars? Have you heard about it recently? He threw it to the Internet and everyone got excited for a minute. Then nerds did quick math and it didn’t make any sense. And so everyone forgot about Mars. This is the same. Hype everyone up for a week or two to inflate stock before the merger/purchase/IPO/whatever. That is all.
Also you say meta will never field a competitor to GPT - but they did llama; not as a commercial product, but probably an attempt at it (and failed). Otherwise agreed.
Worried about natural disasters? Build some place less prone to natural disasters.
Worried about the strain on local communities? Build some place more remote.
Worried about energy availability? Build near a nuclear power plant or hydroelectric power station.
Worried about hostile governments? Don't build data centers within the territories of hostile governments. (If you consider every country a hostile government, that is a you-problem.)
For the cost of building a data center in space, you could instead build a second (or third, or fourth, ...) data center somewhere else.
Well, it's a physics problem. The engineering solution is possibly not cost efficient. I'd put a lot of money that it isn't.
Well first you have to make solar panels works in the polar nights, in winter they have a few minutes of sun in the day at most.
If you want to radiate away the heat, you are either limited by the Stefan-Boltzmann equation which requires extraordinarily large radiators at any reasonable operating temperature, or have to develop a "super-Planckian" radiator technology, something which while it may be theoretically possible doesn't seem to actually exist yet as a practical technology.
The only other plausible technology I can think of would be to use evaporative or sublimation-based cooling, but that would consume vast quantities of mass in the process, every bit of which would have to be delivered to space first.
Has anyone seen any published work that suggests it is actually anywhere near economically feasible to dissipate megawatts of power in space, using either these or any other technology?
This is the big thing, but Elon's child porn generator in orbit will be subject to US jurisdiction, just as much as if they were in Alaska. I guess he can avoid state law.
If jurisdiction is key, you can float a DC in international waters on a barge flying the flag of Panama or similar flag of convenience which you can pretty much buy at this scale. Pick a tin-pot country, fling a few million to the dictator, and you're set - with far less jurisdiction problems than a US, Russia, France launched satellite.
Once you have solutions, it turns into a cost problem. And if that cost is too high (for whatever arbitrary threshold you use for that) it becomes an optimization problem.
This whole thread reads like a lot of "but ... but ... but ...". It all boils down to people assuming things about what is too much or too hard. And it's all meaningless unless you actually bother to articulate those assumptions. What exactly is too hard here? What would it take to address those issues? What would the cost be? Put some numbers on it. There are also all sorts of assumptions about what is valuable and what isn't. You can't say something is too hard or too costly without making assertions about what is worth paying for and what isn't.
The answers are going to be boring. We need X amounts of giga tons launched to orbit at Y amount of dollars. OK great. What happens if launch cost drops by 1 or 2 orders of magnitude? What happens if the amount of mass needed drops because of some engineering innovation? Massively dropping launch cost is roughly what SpaceX is proposing to do with Star Ship. Is it still "too hard"? You can't have that debate until you put numbers on your assertions.
There's a bit of back of the envelope math involved here but we're roughly talking about a million satellites. In the order of ~2.5 million tonnes of mass (at 2.5 ton per satellite). Tens of thousands of Star Ship launches basically. It's definitely a big project. We're talking about 1-2 order magnitude increase of the scale of operations for SpaceX going from lower hundreds to thousands of launches per year spread over maybe 10-15 years to work up to a million satellites.
I'm more worried about what all that mass is going to do when it burns up in the atmosphere / drops in the oceans. At that scale it's no longer just a drop in the ocean.
Is this all an effort to utilize more efficient solar panels? Are solar panels really the limiting factor for data centres?
Everyone is spending crazy amounts of money in the hopes that the competition will tap out because they can't afford it anymore.
Then they can cool down on their spending and increase prices to a sustainable level because they have an effective monopoly.
The physics of consuming bits of old chip in an inefficient plasma thruster probably work, as do the crawling robots and crushers needed for orbital disassembly, but we're a few years away yet. And whilst on orbit chip replacement is much more mass efficient than replacing the whole spacecraft, radiators and all, it's also a nontrivial undertaking
What that does have to do with anything? If you want to solar-power them, you still are subject to terrestrial effects. You can't just shut off a data center at night.
> Or we put the datacenters on giant Zeppelins orbiting above the clouds?
They'd have to fly at 50,000+ ft to be clear of clouds, I doubt you can lift heavy payloads this high using bouyancy given the low air density. High risk to people on the ground in case of failure because no re-entry.
> If we are doing fantasy tech solutions to space problems, why not for a million other more sensible options?
How is this a fantasy? With Starlink operational, this hardly seems a mere 'fantasy'.
First mover advantage, and all.
> which would get regular traffic back-and-forth
I hope it's not a mystery why this commemt has been downvoted
If you assume that these people aren't completely stupid, then there is some reason why they want this workload running at great physical distance from all the people down on Earth. It's probably not to protect people on Earth. After all they'll happily deorbit satellites and other junk from orbit and let it rain down on us. And they will happily destroy the environment with all those rocket launches too. Therefore it must be to protect the workload from us.
What is a workload that is something that people would probably want to destroy, and which would also provide enough value to offset the expense to launch and run in space? The only thing that might make sense is a military AI platform. Think something that observes Earth, launches missiles, and controls terrestrial drone armies remotely, with relatively low latency.
It gets built and launched thanks to endless military budget, and once it is up there, running such an AI from space means that effectively the only people who can take it out are nation state level foes who can launch rockets into low earth orbit. And this thing is a satellite, probably part of a network that is watching the Earth all the time. Start building something that looks like a rocket launch site, and the AI will see, then you get hit by a missile or taken out by a drone first before you get a chance to attack the platform.
It sounds like sci-fi, but in the future, if we let it happen, there could absolutely be nearly invulnerable autonomous AI platforms in space overseeing everything, and making decisions, and issuing commands. Of course there could still be a massive solar flare event, or a Kessler syndrome event that releases us all from AI enforced servitude. Anyway, it's a not so fun thought experiment, and let's hope this stays sci-fi, so we can just enjoy a fun Hollywood film about this rather than experiencing it firsthand.
Openrouter is a decent proxy for real world use and Grok is currently 8% of the market: https://openrouter.ai/rankings (and is less than 7% of TypeScript programming)
Stop this trope please. We (1) don't really know what their margins are and (2) because of the hard tie-in to GPU costs/maintenance we don't know (yet) what the useful life (and therefore associated OPEX) is of GPUs.
> If they stopped training and building out future capacity they would already be raking in cash.
That's like saying "if car companies stopped researching how to make their cars more efficient, safer, more reliable they'd be more profitable"
Space has some huge downsides:
* Everything is being irradiated all the time. Things need to be radiation hardened or shielded.
* Putting even 1kg into space takes vast amounts of energy. A Falcon 9 burns 260 MJ of fuel per kg into LEO. I imagine the embodied energy in the disposable rocket and liquid oxygen make the total number 2-3x that at least.
* Cooling is a nightmare. The side of the satellite in the sun is very hot, while the side facing space is incredibly cold. No fans or heat sinks - all the heat has to be conducted from the electronics and radiated into space.
* Orbit keeping requires continuous effort. You need some sort of hypergolic rocket, which has the nasty effect of coating all your stuff in horrible corrosive chemicals
* You can't fix anything. Even a tiny failure means writing off the entire system.
* Everything has to be able to operate in a vacuum. No electrolytic capacitors for you!
So I guess the question is - why bother? The only benefit I can think of is very short "days" and "nights" - so you don't need as much solar or as big a battery to power the thing. But that benefit is surely outweighed by the fact you have to blast it all into space? Why not just overbuild the solar and batteries on earth?
A satellite is quite unlike a thermos in the sense that it is carefully tuned to keep its temperature within a relatively narrow band around room temperature.[1] during all operational phases.
This is because, despite intended space usage, devices and parts are usually tested and qualified for temperature limits around room temperature.
[1] "Room temperature" is actually a technical term meaning 20°C (exceptions in some fields and industries confirm the rule).
People are acting like a space data centre would be running a traditional workload. No, it's probably running a military one, some sort of AI powered modern version of Dead Hand (https://en.wikipedia.org/wiki/Dead_Hand). Autonomous warfare could get real dark, real fast.
Who is going to pay the money to rent capacity in space when they could rent the same capacity on Earth for a fraction of the cost?
Sure, until you need to replace or upgrade it. How long does a server on earth last for, how often does it need maintenance / replacing? And how long is the expected or desired lifetime for a server in space? Then calculate weight and cost etc.
> Maybe the running costs are cheap enough to offset this.
"Maybe" is hope, you can't build a business on hope / wishful thinking. And the running costs for data centers on earth can be reduced too if you build them the same way as a sattelite - solar panels + battery + radiative cooling gives you enough data to compare. But servers / data centers aren't built that way because of cost vs benefit.
> If achieving the cooling is only very hard and requires careful material engineering, then it can be worked out and they will get it done.
See, it's possible for sure - we HAVE computers in space, powered, cooled, running 24/7. The questions are whether it makes economic sense, both launch costs and running / maintenance costs. That's straight math, and the math isn't mathing.
> I suppose they could make something like the International Space Station, which would get regular traffic back-and-forth exchanging and servicing hardware as needed.
Sure, but the ISS itself cost ~100 billion to build and operate - probably more, this is based on a ten second search query. While I'm sure launches are cheaper than ever and will be even cheaper in the future, it's still tens of billions to build a data center in space, plus you'd need astronauts, supplies, hardware, etc - all a LOT more expensive than the equivalent processing power on earth.
> These are collective problems for the whole of humanity and will not concern an individual actor such as Elon Musk who wants to send more satellites into space.
True, so we as humanity should offer resistance to plans to launch thousands of objects into space unless they have a clear and definite benefit. I'm not worried about Starlink, it's a benefit to all the areas that don't have (open) access to the internet and they're in low-earth orbit so they'll fall back within 5 years. But I just don't see the benefit in putting datacenters in space, not when it's so much cheaper and more viable to put them on earth.
However, with Starship SpaceX has both done more and less than putting a banana in orbit. Less, because it's never once been a true orbit; more, because these are learn-by-doing tests, all the reporting seems to be in agreement that it could already deliver useful mass to orbit if they wanted it to.
But without actually solving full reusability for the upper stage, this doesn't really have legs. Starship is cheap enough to build they can waste loads of them for this kind of testing, but not cheap enough for plans such as these to make sense if they're disposable.
[0] https://en.wikipedia.org/wiki/List_of_Starlink_and_Starshiel...
[1] https://en.wikipedia.org/wiki/List_of_Falcon_9_and_Falcon_He...
I find this to be the most obvious game plan here. Makes total sense from financial engineering point of view.
You _might_ get to develop nice tech/IP to enable other space based businesses at the same time. "we sold them on X but delivered Y". So it's a bit of a hail mary, but makes total sense to me if you want to have a large budget for inventing the future.
Once you can demonstrate even a fraction of this capability of operations ... I think you can sell a "space dominance" offering to Pentagon for example and just keep pedaling.
"We are going to build the perfect weapon" does not necessarily entice as large engineer population as "we are going to Star Trek".
Another thing - if Moon is going to be a thing, then _properties on Moon_ are going to be a thing.
In theories of value in post-ai societies scarce assets like land are going to become more valuable. So it's a long term plan that makes sense if you believe Moon will be a realestate market.
It could also just be ignorance and talking out of his ass to look smart. Like when he took over Twitter and began publicly spewing wrong technical details as if he knew what he was talking about and being corrected by the people actually working on the product.
But the demand / economic viability just isn't there. VR is cool but it's not mainstream. "Metaverse" exists and some companies are making good money off of it (Roblox, Fortnite, MMOs, etc), but nobody wanted Facebook's multi-billion-dollar-invested version of it because they just don't get it. I really hope all this nonsense collapses sooner rather than later and we go back to realistic and viable spending.
Large investments don't translate to results.
It's a physics problem, as others pointed out, but even if we take it as another "just an engineering problem", have a look at the Hyperloop. Which is similarly just a long vacuum tube, and inside is like an air hockey table, not that big a deal, right?...
It is not just a number, as it is for people who just save a few dollars, for whom it really is just a number until they withdraw money to use it. The billionaire's money is not "money", it is actual working assets, and the abstraction of turning this into a number does a terrible job, the result now misunderstood by many. Assets being companies doing stuff mostly (holding non-control-giving paper assets is different and not what being a top capitalist is about, only used as an additional tool below the actual goal). Which they fully control (the small investor does not even have any control worth mentioning when they own shares of a public company).
They don't just play with money, they play with real things! And they want to play with ever bigger real things. They don't just want to improve some minor product. They want to control the fate of civilization.
OT:
I hate this money view with a passion, this is what too many people discussing wealth inequality issues get wrong. This is not Scrooge McDuck and his money pile. Money is an abstraction, and it is misused terribly, hiding what is actually going on for too many observers who then go on to discuss "numbers".
That is also why the idea to "just redistribute the money of the rich" is a failure. It isn't money! It is actual real complex organizations. And you can't just make everything into a public company, and also, even when they are, for better or worse owners don't lead like managers. Doing the socialism thing (I grew up in the GDR) where everybody owns a tiny bit of everything just does not work the same.
We will have to look at what those super-rich are actually doing, case by individual case of ownership, not just look at some abstract numbers. Sometimes concentrated control over a lot of assets is a good thing, and other times it is not. Ignoring the objection of "who would control that?", because right now they control themselves so it's never nobody.
A single server in a data center will consume 5-10 kW.
Quote: "emissivity higher than 0.99 over a wide range of wavelengths". Article title "Perfect blackbody radiation from a graphene nanostructure" [1]. So several rolls of 10 x 50 meters graphene-coated aluminium foil could have significant cooling capability. No science-fiction needed anymore (see the 4km x 4km NVIDIA fantasy)
[1] https://opg.optica.org/oe/fulltext.cfm?uri=oe-21-25-30964
Why not?
A capacity problem can be solved by having another data center the other side of the earth.
If it's that the power cycling causes equipment to fail earlier, then that can be addressed far more easily than radiation hardening all equipment so that it can function in space.
The energy demands of getting to the 240k mile Moon are IMMENSE compared to 100 mile orbit.
Ultimately, when comparing the 3 general locations, Earth is still BY FAR the most hospitable and affordable location until some manufacturing innovations drop costs by orders of magnitude. But those manufacturing improvements have to be made in the same jurisdiction that SpaceXAI is trying to avoid building data centers in.
This whole things screams a solution in search of a problem. We have to solve the traditional data center issues (power supply, temperature, hazard resilience, etc) wherever the data centers are, whether on the ground or in space. None of these are solved for the theoretical space data centers, but they are all already solved for terrestrial data centers.
This is the basics, I'm not an expert. But I don't think that you have anything useful at all to say here.
That being said, this statement strikes me as missing the point:
> Solving cost of launching mass has been the entire premise of SpaceX since day one and they have the track record.
As I understand it, SpaceX has a good track record of putting things into space more cost effectively than other organisations that put things into space.
That is not the benchmark here.
It doesn't matter if Musk can run thousands of data centres in space more cost effectively than (for example) NASA could. It matters whether he can do it more cost effectively than running them on earth.
it's worse, incoming radiation also works to heat up objects that are in sunlight and in space. And you want to be in sunlight for the solar panels.
This is why surface of the moon is at temperatures of -120C when it's night and +120C when it's day there.
And the sun's radiation also flips bits.
Yes, it's technically possible to work around all of these. There are existing designs for radiators in the shade of the solar panels. Radiation shielding and/or resistant hardware. It's just not even close to economic at datacentre scale.
Have you done a calculation yourself?
Starship can replace Falcon 9 and probably be cheaper, if fully reusable, so more profitable. So at least some economic sense is there already.
We still don’t have any plan I’ve heard of for avoiding a cascade of space debris when satellites collide and turn into lots of fast moving shrapnel. Yes, space is big, but low Earth orbit is a very tiny subset of all space.
The amount of propulsion satellites have before they become unable to maneuver is relatively small and the more satellite traffic there is, the faster each satellite will exhaust their propulsion gasses.
The Outer Space Treaty (1967) has a loophole. If you launch from international waters (planned by SpaceX) and the equipment is not owned by a US-company or other legal entity there is significant legal ambiguity. This is Dogecoin with AI. Exploiting this accountability gap and creating a Grok AI plus free-speech platform in space sounds like a typical Elon endeavour.
I was making a snide comment that certain ultra wealthy people don’t need these data centers to send data to earth, because they don’t plan on being here.
How dare he not have accurately predicted when one of the hardest technical problems in history is solved?
And even if viable, why would you just not cool using air down on earth? Water is used for cooling because it increases effectiveness significantly, but even a closed loop system with simple dry air heat exchangers is quite a lot more effective than radiative cooling
And it’s still a vacuum with many of the same cooling issues. I suppose one upside is you could use the moon itself as a heat sink (maybe).
Adding a global UHVDC grid to even out dips in local PV performance due to cloud cover and the diurnal cycle on spaceship earth seems to be magnitudes cheaper and scaleable than this loony pitch.
The only thing making this hard is requiring supranational collaboration.
Starship isn't largely a government project. It was planned a decade before the government was ever involved, they came along later and said "Hey, this even more incredible launch platform you're building? Maybe we can hire SpaceX to launch some things with it?"
Realistically, SpaceX launches far more payload than any government.
Anyway, promising some fantasy and never delivering is definitely a typical Elon endeavor.
If you put a pipe with hot gas inside, in space, it will get colder by convection.
Blow air through the pipe.
He had the same blind spots that Ayn Rand did, but perhaps better informed of the fascist-adjacent US culture.
One of the good sci fi/social ideas he had was about what it meant to "grok" something. groklaw.net of happy memory was exactly what that verb was supposed to mean, dive into something until you understand it at a molecular level.
The fact that Musk et al have stolen terms like "grok" and even "cyberspace" as if they own them is something I loathe.
Space is cold but has little mass. Either heat can radiated or transfered. To transfer heat, mass which easily absorbs heat is required. The moon might be suitable for that.
Can SpaceX not just say "OK, GPU #7 on satellite #15872 is broken, don't use it" and just accept that they're now overbuilt on power/cooling for that sat?
They were also working on a "zero energy" train that would run "downhill" from the mines to the ports to charge its batteries that would then take the empty train back to the mine.
Battery tech wasn't sufficient (yet), but that doesn't mean it can't come back when solid state and sodium ion batteries come online.
This is exactly like the Boring Company plans to "speed up" boring. Lots of hand waving away decades of commercial boring, sure that their "great minds" can do 10x or 100x better than modern commercial applications. Elon probably said "they could just run the machines faster! I'm brilliant".
Distributing useful work over so many small objects is a very hard problem, and not even shown to be possible at useful scales for many of the things AI datacenters are doing today. And that's with direct cables - using wireless communication means even less bandwidth between nodes, more noise as the number of nodes grows, and significantly higher power use and complexity for the communication in the first place.
Building data centres in the middle of the sahara desert is still much better in pretty much every metric than in space, be it price, performance, maintainance, efficiency, ease of cooling, pollution/"trash" disposal etc. Even things like communication network connectivity would be easier, as at the amounts of money this constellation mesh would cost you could lay new fibre optic cables to build an entire new global network to anywhere on earth and have new trunk connections to every major hub.
There are advantages to being in space - normally around increased visibility for wireless signals, allowing great distances to be covered at (relatively) low bandwidth. But that comes at an extreme cost. Paying that cost for a use case that simply doesn't get much advantages from those benefits is nonsense.
I'm not a space engineer but I'd imagine that smaller satellites can make due with a lot of passive cooling on the exterior of the housing, whereas a shopping-mall sized computer in space would will require a lot of extra plumbing.
The limiting factor isn't the emissivity, it's that you're having to rely on radiation as your only cooling mechanism. It's super slow and inefficient and it limits how much heat you can dissipate.
Like the other person said, you can't do any better than blackbody radiation (emissivity=1).
Famous investors like to repeat the quote that “when the tide goes out, that’s when we find out who’s wearing no pants.” When Tesla actually weathers its first market downturn is when we find out how much investors interest is maintained When investment dollars are scarce.
You plant a PV panel and add its irrigation (power interconnect) and remote monitoring, then you harvest power for the next 25+ years.
Ethanol production excess is a specific US problem because of the misalignment of incentives and lobbying.
What exactly has Elon done that's "impossible"? Like the Boring Company where he promised 1,000x faster boring? It turned into a mile or two of a poorly routed hole with some Teslas tossed down into it. He and his shills hand waved away the problem, confident their brilliance would allow them to dig 1,000x faster than modern commercial boring. It never happened.
The only impossible thing Elon has done is make fantasy claims and real people fall for it.
The ISS is the single most expensive thing built by humankind ($100b+). What makes you think that building a "space casino" or "space resort" is commercially viable?
This might also be a new vehicle to mask any space warfare technology deployments.
But general purpose compute no
(1) There are orbital arrangements that allow satellites to stay close together with minimal orbital corrections. Scott Manley mentioned this in one of his videos.
Overbuilding also comes with a cost when talking about space, it is still very costly to get stuff up there and there is limited bandwidth downstream, you want to balance those two. So if you're overbuilding it costs a lot to get up there, if you disable what's up there you don't fully utilize the bandwidth.
For example AI data centers now use very different hardware compared to 5 or 10 years ago that upgrade path is just a lot harder when your data center is in space.
The self-driving car worked too well. Tesla is promising that for over a decade now, and still can't deliver. They came much closer to the goal, but are still very far away from it. Shareholders don't seem to care.
You are aware physical persons exist on Earth and can be taken into custody? Additionally, space weapons exist, several governments could destroy any orbital satellite.
This whole pipe dream is nonsense.
The 2025 profit margin for Telsa was 4.6%. Toyota's was 9.4%. Telsa is famously on a multi-year sales and revenue decline.
https://pluralistic.net/2024/05/17/fake-it-until-you-dont-ma...
Is that 5kW of electrical power input at the terminals, or 5kW irradiation onto the panels?
Because that sounds like kind of a lot, for something the size of a fridge.
Pretty much everything else though is just vapourware.
To use that loophole, the rockets launched by SpaceX would have to be “not owned by a US-company”. Do you think the US government would allow that to happen?
But heat radiation rates are proportional to temperature to the 4th power!!!!
That is a magical law. The quality of heat pumps used to concentrate heat, will drive the economics and structure of heat dissipation.
Seldom do we get constraints that favorable to work with.
We're living in the Age of Distraction… amusing ourselves to death (as usual).
then anything that drives money towards your work on that goal is worth pursuing particularly if you think time is short.
Sun-synchronous orbit means solar panels collect the same amount 24/7. I guess that's the #1 benefit. Cheap energy.
Think of heat like flowing water or charge. Only an altitude or voltage delta creates the flow needed to harvest energy.
You get no useful energy from heat you are already trying to shed because you have no delta to work with. (The entire problem exists because there is no surrounding environment with high heat capacity and lower heat.)
Are Earth-based datacenters actually bound by some bottleneck that space-based datacenters would not be? Grid connections or on-site power plants take time to build, yes. How long does it take to build the rocket fleet required to launch a space “datacenter” in a reasonable time window?
This is not a problem that needs to be solved. Certainly not worth investing billions in, and definitely not when run by the biggest scam artist of the 21st century.
Source: I am out of LEDs and LASERs and now handle aerospace solar for a private company. Guess who almost everyone in the private sector flies on?
I suspect that Musk wants to build space data centers in order to mitigate political and societal problems, which may yet prove more intractable than cooling in space.
The current expansion of terrestrial data centers has already caused a huge backlash. Their adversaries may well try to regulate them out of existence, at least locally. If an important jurisdiction like California or Germany subjects building of new data centers to regulations similar to building, say, a new nuclear power station, they will achieve a de-facto stop on further development there even without banning them outright.
Space, while not entirely lawless, is much harder to regulate this way. Local authorities have no power over it, nor do governments of nations without space capabilities. Big authorities of big nations (the FAA etc.) do, but they will likely be more friendly to already established launch businesses like SpaceX, not least because of the geopolitical dimensions of having a vibrant space sector.
From Musk's POV, this may be worth the additional cost and technical troubles.
Minimizing payload at any point was easily worth a billion dollars. And given how heavy and nessisary the radiators are (look them up), you can bet a decent bit of research was invested in making them lightweight.
Heck, one bit of research that lasted the entire lifetime of the shuttle was improving the radiative heat system [1]. Multiple contractors and agencies invested a huge amount of money to make that system better.
Removing heat is one of the most researched problems of all space programs. They all have to do it, and every gram of reduction means big savings. Simply saying "well a DC will need more of it, therefore there must be low hanging fruit" is naive.
On the ground, legal notions of private property provide some legal protections against national government interference. But there is no private real property in space. 100% of the volume of space is subject to the direct jurisdiction of terrestrial national governments. Every artificial satellite persists only because they are permitted to do so by their national government.
Because of the speed and energy involved, in the U.S. all private space activity is a matter of national security. This means that there are far fewer legal protections, not more. The U.S. president could directly order SpaceX to do almost anything, and they would have to comply. Musk spends tremendous energy and money maintaining alignment with the governments he needs to satisfy to stay in business.
The "put 500 to 1000 TW/year of AI satellites into deep space" for example, that's as far ahead of the entire planet Earth today as the entire planet Earth today is from specifically just Europe right after the fall of Rome. Multiplicatively, not additively.
There's no reason to expect any current business (or nation, or any given asset) to survive that kind of transition intact.
To keep things in orbit ion thrusters work nicely and require just inert gases to keep them functioning. Plus on a low Earth orbit there are suggestions that a ramjet that capture few atoms of atmosphere and accelerates them could work.
Radiative cooling scales by 4th power temperature. So if one can design electronics to run at, say, 100 C, then calling would be much less problematic.
But radiation is the real problem. Dealing with that would require entirely different architecture/design.
Because the permitting process is much easier and there are way, way fewer authorities that can potentially shut you down.
I think this is the entire difference. Space is very, very lightly regulated, especially when it comes to labor, construction and environmental law. You need to be able to launch from somewhere and you need to automate a lot of things. But once you can do this, you escaped all but a few authorities that would hold power over you down on Earth.
No one will be able to complain that your data center is taking their water or making their electricity more expensive, for example.
https://paulgraham.com/submarine.html
> Why do the media keep running stories saying suits are back? Because PR firms tell them to. One of the most surprising things I discovered during my brief business career was the existence of the PR industry, lurking like a huge, quiet submarine beneath the news. Of the stories you read in traditional media that aren't about politics, crimes, or disasters, more than half probably come from PR firms.
Musk is running out of runway on his way to infinity dollars and since Tesla is slowly crumbling compared to its valuation, the ideas need to become crazier and crazier: humanoid robots tomorrow, self driving taxis tomorrow, reusable rockets going to Mars tomorrow, data centers in space tomorrow.
It would be fun to watch if Musk wouldn't funnel a lot of money that could be used for good, instead. Imagine how many diseases we could cure with all that money. Or feed and educate the poor. Or how much walkable and bikeable and ultimately liveable infrastructure we could build world wide. Or how fewer plastics we could use, ingest and discard if we could promote healthy and natural alternatives.
And techies fall for his stories every time, hook, line and sinker, because he's speaking about core geek fantasies.
Someone mentioned in the comments on a similar article that sun synchronous orbits are a thing. This was a new one to me. Apparently there's a trick that takes advantage of the Earth not being a perfect sphere to cause an orbit to precess at the right rate that it matches the Earth's orbit around the sun. So, you can put a satellite into a low-Earth orbit that has continuous sunlight.
https://en.wikipedia.org/wiki/Sun-synchronous_orbit
Is this worth all the cost and complexity of lobbing a bunch of data centers into orbit? I have no idea. If electricity costs are what's dominating the datacenter costs that AI companies are currently paying, then I'm willing to at least concede that it might be plausible.
If I were being asked to invest in this scheme, I would want to hear a convincing argument why just deploying more solar panels and batteries on Earth to get cheap power isn't a better solution. But since it's not my money, then if Elon is convinced that this is a great idea then he's welcome to prove that he (or more importantly, the people who work for him) have actually got this figured out.
Optimization is literally how contractors working for the government got rich. Every hour they spent on research was directly billed to the government. Weight reduction being one of the most important and consistent points of research.
Heck, R&D is how some of the biggest government contractors make all their dough.
SpaceX is built on the billions in research NASA has invested over the decades. It looks like it's more innovative simply because the USG decided to nearly completely defund public spending in favor of spending money on private contractors like SpaceX. That's been happening since the 90s.
When one does the math on the operating temperatures of regular computing equipment that we use on Earth, how much heat it generates per watt, and how fast it would need to sink that heat to allow for continuous operation, one gets surface areas that are not impossible, but are pretty on the high end of anything we've ever built in space.
And then you have to deflect the incoming light from the Sun which will be adding to your temperature (numbers published by private space companies regarding the tolerances of payloads those companies are willing to carry note that those payloads have to be tolerant of temperatures exceeding 100° C, from solar radiation alone). That is doable, you could sunshield the sensitive equipment and possibly decrease some of your thermal input load by putting your craft out near L2 which hangs out in the penumbra of Earth. Still a daunting technical challenge when the alternative is just build it on the planet with the technology and methods we already have.
It may happen one day, but we are very, very far from that. As of now, big countries watch their space corporations very closely and won't let them do this.
Nevertheless, as an American, you can escape state and regional authorities this way. IIRC The Californian Coastal Commission voted against expansion of SpaceX activities from Vandenberg [1], and even in Texas, which is more SpaceX-friendly, there are still regulations to comply with.
If you launch from international waters, these lower authority tiers do not apply.
[1] https://www.latimes.com/business/story/2025-08-14/california...
This means you need some sort of heat pump. For a practical example you can look at the ISS, which has what they call the "External Active Thermal Control System" (EATCS), it's a complicated system and it provides 70kW of heat rejection. A datacenter in space would need to massively scale up such a system in order to cool itself.
If you're looking at this and saying "Lol, no, we don't need data centers in space just to power more GPT sycophancy and some health insurance company's RAG workflows." Then you're right, so just move on from that usage and consider the things we'd like to do in space, and especially the things we're already doing but want to do more of.
I know, my gut was telling me this is ridiculous, premature at best even through the lens of expanding space industry. But then with respect to the need for data centers-- had I even thought about it a year ago, my gut would have laughed if someone had said "Buy Wester Digital, HDD's are a growth stock".
This. Like it would make far more sense to colonize the poles than Mars.
You can’t read a 300 word article in 1930 and know that a formula 1 engine could not be built.
A grift the size of Dogecoin, or the size of "free speech" enthusiast computing, or even the size of the criminal enterprises that run on the dark web, is tiny in comparison to the footer cost and upkeep of a datacenter in space. It'd also need to be funded by investments (since criminal funds and crypto assets are quite famously not available in up-front volumes for a huge enterprise), which implies a market presence in some country's economy, which implies regulators and risk management, and so on.
That.
Also, am I the only one to remember when SpaceX was supposed to pivot to transporting people from cities to cities, given how cheap and reusable and sure BFF/Starship was going to be ?
Or how we were all going to earn money by pooling our full self driving cars in a network of robo taxis ?
In all seriousness, what is the number of "unrealized sci-fi pipe dreams" that is acceptable from the owner a company ? Or, to be fair, what is the acceptable ratio of "pipe dreams" / "actually impressive stuff actually delivered (reusable rockets, starlink, decent EVs, etc...)" ?
Office's moat is much bigger (and its competition already free). "New vibe coded features every week" isn't an obvious reason for Office users to switch away from the platform their financial models and all their clients rely on to a new upstart software suite
Tesla's valuation has been nuts for a while. The music was going to stop playing at some point, so something something robotaxis, something something androids, something something AI. Keep the investors duped while you can move money around and leverage it to stay relevant.
Cars are out, social media as well (especially X), but Space is still in, and even more so AI. So let's move the cost center with world domination potential (AI) over to the one company that's making money and has a still has a cash-out potential via an IPO.
I'm just so tired of it all. I actually think 'boutique' businesses (companies that generate real value to real users and are profitable now) are the only thing that can save our economy medium-term, but investors and the government are having none of it. And the result is that these bait-and-switch scams will continue.
You're literally describing steelmanning, which GP explicitly set out to do.
> It’s like a mental game that some of us cannot help but play.
Despite attempting to rephrase, you're still coming across as projecting your own internal issues onto GP's comment. Directly addressing the (worthwhile) points they made in their comments rather than attempting to analyze the meta of the basic nature of someone you've never met is the way to go.
Besides this, it's concerning how much stuff we're sending to space. One day we'll have to start worrying about satellite parts falling on us.
> Tesla sold 20,237 Cybertrucks in 2025, down from 38,965 the previous year, according to figures from Kelley Blue Book's annual electric vehicle (EV) sales reports.
https://www.cbsnews.com/news/tesla-cybertruck-sales-elon-mus...
> A federal safety report shows that Tesla is recalling 63,619 of its futuristic pickups, and this seems to be the total number of Cybertrucks built since the first one was delivered at the end of 2023.
https://www.arenaev.com/teslas_latest_recall_reveals_real_cy...
> Musk said that it's time to put the Model S and Model X vehicles to rest. Now it's not that huge of a change, given that 97% of Tesla's sales consist of Model 3 and Model Y cars, but the Model S is still the original car delivered by Tesla.
https://www.arenaev.com/tesla_discontinues_the_model_s_and_m...
> The financial report paints a grim picture for the company. Tesla's total profit for 2025 was €3.24 billion. That is a lot of money, whichever way you look at it, but it is actually 46 percent less than what the company made in 2024. The profit margin, which is the percentage of money the company keeps after paying expenses, fell to just 4.9 percent. In 2022, that number sat at 23.8 percent.
> One of the most interesting parts of the financial report is how Tesla made its money. A large chunk of its profit did not come from selling EVs to people. Instead, it came from selling "regulatory credits" to other car companies that need help meeting pollution rules. These credits brought in €2 billion.
> That means 52 percent of Tesla's entire profit for the year came from these credits, not from selling vehicles. If Tesla did not have those credits, the financial results would look much worse. And the problem the company is facing? Those credits are gone; they won't be part of Tesla's business model this year since they were cancelled by the current administration.
https://www.arenaev.com/tesla_profits_drop_as_automaker_star...
Tesla is betting on long shots like humanoid robots and self driving taxis everywhere. There are other desperation moves like merging Tesla (profitable) with SpaceX (I think it's also profitable? but most of its business is governments: risky markets) and xAI (most likely wildly unprofitable, just like Twitter).
This is a pump-and-dump bid for investor money. They will line up to give it to him.
How unbelievably crass. "Let's build something out of immense quantities of environmentally-destructive-to-extract materials and shoot it into space on top of gargantuan amounts of heat and greenhouse gas emissions; since it won't use much earth-sourced energy once it's up there, that nets out to a win!"
Insane.
There must be many power consumers in the satellite, e.g. radio receivers, lasers, computers and motors, where the consumed energy eventually is converted into heat, but the radio transmitter of a communication satellite must take a big fraction of the average consumed power.
The radio transmitter itself has a great efficiency, much greater than 50%, possibly greater than 90%, so only a small fraction of the electrical power consumed by the transmitter is converted into heat and most is radiated in the microwave signal that goes to Earth's surface.
My take-away is - SpaceX is still an extremely good stock to hold. However, the stupid money will buy the stock at IPO on the promise of space datacentres.
When SpaceX inevitably u-turns on this plan and the stock plummets temporarily, THAT will be a good time to buy in.
It's a casino and the mirage of billionaire competency would vanish instantly if the media were even slightly skeptical.
The media is owned, it's a sham. It's a play.
> And techies fall for his stories every time, hook, line and sinker, because he's speaking about core geek fantasies.
Not all techies, but enough of them to keep the raft afloat.
Dealing in hallways gossip is not the job we granted the press extra constitutional protections for.
So there's no regulatory or tax benefit to hosting in space.
Nvidia GPUs, particularly H100s, have a failure rate orders of magnitudes higher than traditional CPU-only hardware. I myself have accidentally melted an H100 during a large-scale training run.
While it’s trivial to replace a broken GPU in the ground, it seems to be infeasible in space during the life of the satellite. Getting a human or robot “fixer” spacecraft to it would likely cost more than the $30K GPU itself.
Thus the extremities of the foil, which are far from the satellite body, will be much cooler than the body, so they will have negligible contribution to the radiated power.
The ideal heatsink has fins that are thick close to the body and they become thinner towards extremities, but a heatsink made for radiation instead of convection needs a different shape, to avoid a part of it shadowing other parts.
I do not believe that you can make an efficient radiation heatsink with metallic foil. You can increase the radiating surface by not having a flat surface, but one covered with long fins or cones or pyramids, but the more the surface is increased, the greater the thermal resistance between base and tip becomes, and also the tips limit the solid angle through which the bases radiate, so there must be some optimum shape that has only a limited surface increasing factor over the radiation of a flat body.
as always: imho. (!)
we already had this topic before, an example for another good article regarding physical arguments against this idea would be:
"Datacenters in space are a terrible, horrible, no good idea" ~ late 2025
* https://taranis.ie/datacenters-in-space-are-a-terrible-horri...
TL;DR: It's not going to work.
idk ... maybe elon has something else in mind with this merger!?
cheers,
a..z
No? You'd only need one with lots of gpus on the ship at the same time
You'll note that there is still a frame that it gets unfolded with and that you've got the additional mechanical apparatus to do the unfurling (and the human there to fix it if there are problems.
Again, you'll note that there is frame material there.
You don't have a sheet of glass on it, but space doesn't give you the mass savings you think it does.
Those are cutting edge tech (designed to work at Jupiter's distance) and that's about 40 m^2 of space (ten times more than you're describing) and they mass 176 kg ( https://doi.org/10.1007/s11214-025-01190-6 ). If we assume that scales down linearly, the cutting edge technology for solar panels is 20kg for 4m^2 which is more than your estimates. ... And they have problems and can fail to deploy. https://spacenews.com/cygnus-solar-array-fails-to-deploy/ https://spaceflightnow.com/news/n1105/25telstar14r/index.htm... https://www.nasa.gov/history/50-years-ago-skylab-2-astronaut... https://ntrs.nasa.gov/api/citations/20210020397/downloads/Al...
You'll note that the Cygnus used the same design as Lucy, though smaller.
https://en.wikipedia.org/wiki/Cygnus_(spacecraft)
> Starting with the Enhanced variant, the solar panels were also upgraded to the UltraFlex, an accordion fanfold array, and the fuel load was increased to 1,218 kilograms (2,685 lb).
Digging more into Ultra Flex, https://www.eng.auburn.edu/~dbeale/ESMDCourse/Site%20Documen...
> Specific performance with 27% TJ cells: >150 W/kg BOL & > 40 kW/m3 BOL
So there's your number. 150 W/kg of solar panel array. 1 kW is about 7 kg.
They're not cheap.
https://spacenews.com/36576ousted-from-first-orion-flight-ci...
> In 2011, Orbital replaced Dutch Space on the project and gave ATK’s space components division, which was already supplying the substrates for Dutch Space’s Orion solar panels, a $20 million deal to provide UltraFlex arrays for later Cygnus flights.
The research article linked above does not claim a better emissivity than Vantablack, but a resistance to higher temperatures, which is useful for high temperature sensors (used with pyrometers), but irrelevant for a satellite that will never be hotter than 100 Celsius degrees, in order to not damage the electronic equipment.
Survivor bias. He's had how many failed businesses? 10? Probably more.
Ah, I see the idea now. It is to get people to talk about robotics and how robots will be able to do all this on the moon or wherever.
Instantly pumps Tesla stock here now on earth!
Solar in space is about 5-10x as effective as solar on the ground.
Nobody describes a satellite by specifying the amount of heat that it produces, but by the amount of electrical energy that it consumes.
In a communication satellite, a large fraction of the consumed electrical energy goes into the radio transmitter. Radio transmitters are very efficient and most of the consumed power is emitted as radio waves and only a very small part is converted into heat, which must be handled by the cooling system.
So in any communication satellite, a significant fraction of the consumed energy does not become heat.
This is with an ideal radiator and perfect pointing so it receives no incident light, so in practice you need a bigger one than this.
However, if you think launching a solar panel that is the size of 10 NYC city blocks is "manageable," then why not throw in a radiator that is about 15 city blocks in size?
A satellite as a whole will come to thermal equilibrium with space at a fairly reasonable temperature, the problematic part is that the properties of electricity make it easy to concentrate a good part of the incoming energy in a small area where the GPU is. Heat is harder to move than electricity and getting that heat back out to the solar panels or radiators requires either heavy heat pipes or complex coolant pumps.
And take off again, if reusable spacecraft are meant to be used.
There’s some truly magical thinking behind the idea that government regulations have somehow made it cheaper to launch a rocket than build a building. Rockets are fantastically expensive even with the major leaps SpaceX made and will be even with Starship. Everything about a space launch is expensive, dangerous, and highly regulated. Your datacenter on Earth can’t go boom.
One is based on boring old analysis, hard numbers, and, worst of all, continually updating the analysis as more information (e.g., Raptor’s severe expectations vs reality shortfall) becomes available. People who use this approach don’t seem to have an opinion of Starship that is trending upward.
The other approach seems to be based on vibes, and trusting that Starship will meet its original design goals despite the fact that no rocket project has ever come close to such an achievement. If there’s ever any introspection about why Starship should be the exceptional project that actually does meet its performance goals, the conclusion tends to be something about how Starship is special because it’s being developed by a private company. And I’ve noticed that, if the conversation does get to this point, you can send it in all sorts of unpredictable and fascinating directions by saying words like “OTRAG” and “Conestoga.”
So your huge metal plate would radiate (1673/374)^4 = 400 times less heat, i.e. only 125 kW.
In reality, it would radiate much less than that, even if made of copper or silver covered with Vantablack, because the limited thermal conductivity will reduce the temperature for the parts distant from the body.
For a benchmark - the IIS uses about 4500sqft (420 sqm) of radiators just to keep it's onboard equipment (~70KW) cooled. That's ~150-200 W/sqm.
That means, per GPU, you'd need about 2.5-3.0 sqm of passive radiators.
For a 1MW satellite (~8 datacenter racks of GB200/NVL72) you'd need basically half a football field of bleeding-edge solar panels (that also need to radiate their heat on the reverse side) and a similar sized cooling array of heat radiators for the electronics.
This is on the scale of 40-50 tons - about 10% of the IIS. This should fit on falcon heavy or starship - assuming the solar array and radiators can fold up to fit inside. You could, purely based on weight, launch 2 of these per starship launch.
If you consider the Opex savings (electricity, rent, facilities maintenance) and putting 2 of these on a single starship launch, I still think the ROI would be too long. You're saving about ~$1M per year in Opex but it's costing you $25M to launch it into space and likely an extra ~$50M in satellite equipment (based on starlink satellite costs) on top of the compute. Will those GPUs still be useful in 10 years? Probably not.
I don't think the math is there that justifies the free electricity - even at gigawatt scale (thousands of satellites mass-produced) and at a dramatically lower cost per satellite and per launch. Getting costs down on this would involve tightly integrating the compute and the satellite hardware which would make upgrading the compute independently from the cooling/power infrastructure in the future a significant challenge.
If it had the same data center to rock ratio as earth, it would just end up being earth in the end, and earth doesn't seem to be wanting to stick to its equilibrium either right now
Moreover, a heat pump would add an equipment with moving parts that can fail, requiring maintenance.
But in all seriousness, if there is a possibility of building industrial centers outside of the Earth’s atmosphere, it is surely not here yet. Lots of areas would need improvement.
Then it's roughly 10x-15x and still works.
> Invest in reality, not in billionaire's fantasies.
SpaceX has dramatically reduced payload cost already. How is that a fantasy?
https://www.nextbigfuture.com/2022/02/spacex-reusable-rocket... -- looks like target price for Starship launch would be $3--$5m according to the author.
Wouldn't the /kg price to SpaceX be:
3000000/100000 = $30/kg -- 5000000/100000 = $50/kg?
If they recover everything and produce fuel at scale, wouldn't it drop the cost even more.
What many people quote here are commercial rates, I think. SpaceX won't pay those prices.
Can someone check my math
Parent said it would make more sense.
I guess in terms of the relative level of stupidity on display, it would be slightly less stupid to build huge reflectors in space than it is to try to build space datacenters, where the electricity can only power specific pieces of equipment that are virtually impossible to maintain (and are typically obsolete within a few years).
From individual POV yes, but already Falcons are not that expensive. In the sense that it is feasible for a relatively unimportant entity to buy their launch services.
"The satellite is built on Earth, so I’m not sure how it dodges any of those regulations practically."
It is easier to shop for jurisdiction when it comes to manufacturing, especially if your design is simple enough - which it has to be in order to run unattended for years. If you outsource the manufacturing to N chosen factories in different locations, you can always respond to local pressure by moving out of that particular country. In effect, you just rent time and services of a factory that can produce tons of other products.
A data center is much more expensive to build and move around. Once you build it in some location, you are committed quite seriously to staying there.
I'm not advocating for space GPUs as a logical next step. so many unsolved problems remain
point is that launch costs per kg are a more realistic blocker than cooling
Nobody should doubt that it's possible, since it's been done. It just doesn't make any sense to do it purely for the sake of having computers do things that could be done on the ground.
There's nothing weird about using jet engines to make electricity. The design of a turbine designed to generate thrust isn't necessarily that different from a turbine designed to generate electricity. You can buy a new Avon gas turbine generator today, the same engine used in the Canberra, Comet, Draken, and many others. It makes about a million times more economic sense than putting GPUs in space to run LLMs.
That is clearly not true. How do you power the data center on antarctica? May i remind you it will be in the shadow of earth for half a year.
This may be what they are going for, but there are two effectively religious beliefs with this line of thinking, IMO.
The first is that LLMs lead to AGI.
The second is that even if the first did turn out to be true that they wouldn't all stumble into AGI at the same time, which given how relatively lockstep all of the models have been for the past couple of years seems far more likely to me than any single company having a breakthrough the others don't immediately reproduce.
2 * pi * r^2 * L / (4 * pi * d) * (1 -a) = 4 * pi * r^2 * sigma * T^4
This is Musk, yet again, pulling themes from sci-fi books. He has that vision of ushering in the "future" which is good for dragging us forward but also he fails a lot. His open letter cited the Kardashev scale and his vision for getting us forward like in the novel accelerando.
A cosmic ray striking a chip doesn’t cause a bitflip - it blows out the whole compute unit and permanently disables it. It is more like a hand grenade going off.
Does not feel like a vibe.
Of course it doesn’t fucking make sense to put data centers into space. Even if heating were solved somehow magically, server disks are veeery prone to fail and need replacement. Shoot a rocket up every week to replace failed drives or absolutely burned through GPUs? Yeah, that doesn’t even remotely sound feasible.
What do you mean we don’t have any plans to avoid that? It is a super well studied topic of satelite management. Full books have been written on the topic.
Here is just one: https://ntrs.nasa.gov/api/citations/20230002470/downloads/CA...
Did you think satelites are kept apart by good luck and providence?
How's that full-self driving promised for decades working out?
How's the destruction of USAID working out (oh you wouldn't know a million dead now)
We already have a data-center in space, sort-of, here's how many radiation panels it has to deploy for just the heat produced from the small number of low-power computers
* https://i.sstatic.net/cpIBo.jpg
(ISS, all those white panels are thermal heat radiators)
The “+ solar power” part is the majority of the energy. Solar panel efficiency is only about 25-30% at beginning-of-life whereas typical albedos are effectively 100%. So your estimate is off by at least a factor of three.
Also, I’m not sure where you got 5 kw from. The area of the satellite is ~100 m2, which means they are intercepting over 100 kw of bolometric solar power.
This is a Musk escapade, so my guess would be extraterritoriality and absence of jurisdiction.
"So here's what I did. I built a simple model that reduces the debate to one parameter: cost per watt of usable power for compute. The infographic below lets you change the assumptions directly. If you disagree with the inputs, great. Move the sliders. But at least we'll be arguing over numbers that map to reality.
The model is deliberately boring. No secret sauce. Just publicly available numbers and first-principles physics: solar flux, cell efficiency, radiator performance, launch cost, hardware mass, and a terrestrial benchmark that represents the real alternative: a tilt-wall datacenter sitting on top of cheap power. "
"Here's the headline result: it's not obviously stupid, and it's not a sure thing. It's actually more reasonable than my intuition thought! If you run the numbers honestly, the physics doesn't immediately kill it, but the economics are savage. It only gets within striking distance under aggressive assumptions, and the list of organizations positioned to even try that is basically one."
turns out pit mining is good for the environment after all
GPT-4o mini: The term for financial moves where new investors are continually recruited to pay off previous ones is often referred to as a "Ponzi scheme." Another similar term is "pyramid scheme," where returns are paid to earlier investors from the contributions of newer investors, but with a structure that typically requires participants to recruit others to earn returns. Both schemes are unsustainable and illegal.
It’s not an automatic deal breaker, of course. Falcon 9 is obviously a promising success. But Starship is also working with some new challenges that Falcon 9 didn’t have to worry about.
Many of these stem from design compromises that were forced by Starship’s secondary goal of being capable of a trip to Mars. In that respect, it very much resembles another major project to produce a heavy launch vehicle with a reusable combination payload fairing and upper stage that is also capable of carrying a human crew: the Space Shuttle.
- SpaceX launched its first rocket successfully.
- California voted to build high speed rail.
Eighteen years later:
- SpaceX has taken over the space industry with reusable rockets and a global satcom network, which by itself contains more than half of all satellites in orbit.
- Californian HSR has spent over thirteen billion dollars and laid zero miles of track. That's more than 2x the cost of the Starship programme so far.
Building stuff on Earth can be difficult. People live there, they have opinions and power. Their governments can be dysfunctional. Trains are 19th century technology, it should be easier to build a railway than a global satellite network. It may seem truly magical but putting things into orbit can, apparently, be easier.
Deserts have good sun exposure and land availability but extremely poor water resources, which is necessary for washing the sand off the panels. There are many challenges with scaling both terrestrial and orbital solar.
> [I recommend] all of them, especially Surface Detail
The advantage of 24/7 solar power is clear, obvious, and undeniable, it's just a question of whether that's outweighed by the other disadvantages.
Power input and heat radiation both scale with area so maybe there is some way to achieve this at scale. For instance, maybe it will not look like a traditional data center or even traditional chips.
Space changes this. Laser based optical links offer bandwidth of 100 - 1000 Gbps with much lower power consumption than radio based links. They are more feasible in orbit due to the lack of interference and fogging.
> Building data centres in the middle of the sahara desert is still much better in pretty much every metric
This is not true for the power generation aspect (which is the main motivation for orbital TPUs). Desert solar is a hard problem due to the need for a water supply to keep the panels clear of dust. Also the cooling problem is greatly exacerbated.
What they are trying to do is an a very ambitious engineering challenge in several highly integrated domains, from spaceships to robotics, gpu, server design , ai. Typical stakes are high margins are high.
Project also pushes boundaries of what human can do the same way starlink did. 20 years ago starlink scale was also an "impossible" thing. Is it possible now to push one gpu and serve it from space? Yes, can you do it at scale? Big question.
Obstacles :
Price per kg to orbit. They aim to go from $150 to $10 per kg. Can they deliver? Big question, but having something that demands so many starship, like GPU heavy tasks, will help them achieve this goal. Benefits? No rent, no cooling issues, cheap sun-powered electricity 24 hours a day, unlike anywhere else on Earth.
Jurisdiction. Servers can't be shut down or taken away by police, etc.
Cooling. Yes, it's a vacuum, but with $10 per kg, you can deliver pipes and coolant, and since you don't have space constraints, you can build these pipes with a robot, making that datacenter extremely cheap.
3. Labor. If a robot can do primitive tasks combined with design that is fully remote, you labor costs goes almost to 0.
the output: with $10 per pg, delivering solar panels, coolant + robot for some urgent fixes. Robots even with current technology can swap a harddrive for example, especially if hardware is built to be mantained by robots not human. You don't need large construction, you invest into design, that once assembled , cost you maybe comparable amount of hardware to deliver. After that it runs for free!
The economy if this obviously beating anything exised on earth.
One of the motivations behind this whole thing could be that he could make a way for foreign talent to work on space projects without the necessary government signoff.
The lack of launch costs more than offset the need for extra panels and batteries.
Total pipe dream. They can't take away your servers, but they can imprison you until you provide access. And SpaceX would still fall under the laws of whichever country it's based in. If lawful access is really a problem, laws will be written to make it SpaceX's problem. Relevant XKCD: https://xkcd.com/538/
Obviously you use the backside of the massive area of PV you need, for an equally massive area for HOPG radiator films with condensor coils (because obviously you use heatpumps for cooling, not pure liquid).
Consider the obvious ways you'd actually do it, not the most naive ways.
The GPU pods obviously won't weigh the same as a terrestrial rack. Space based solar arrays obviously don't weigh the same as your hail and storm resistant panels on your roof (see ROSA, but there might be another 10x weight reduction if using flexible solar in tension from rotation). Noone cares about a couple 100 ms extra for first token.
Solar wind and drag are in my opinion the biggest issue. Problem : it's a giant surface catching drag and solar wind. Solution : it's a giant solar sail. Controlling the angle of PV for useful thrust, that's never really been done for a satellite.
Of course this doesn't solve the myriad problems, but it does put dissipation squarely in the category of "we've solved similar problems". I agree there's still no good reason to actually do this unless there's a use for all that compute out there in orbit, but that too is happening with immense growth and demand expected for increased pharmaceutical research and various manufacturing capabilities that require low/no gravity.
- We can't do that
- Why not?
- Well, physics for one.
- What do you mean?
- Well, at the very least we need to be able to emit enough RF-energy for a mobile base station to be able to detect it and allow itself to be convinced it is seeing valid signaling.
- Yes?
- The battery technology that fits within your constraints doesn't exist. Nevermind the electronics or antenna.
- Can't you do something creative? We heard you were clever.
I distinctly remember that last line. But I can't remember what my response was. It was probably something along the lines of "if I were that clever I'd be at home polishing my Nobel medal in physics".
Even the sales guy who dragged me into this meeting couldn't keep it together. He spent the whole one hour drive back to the office muttering "can't you do something creative" and then laughing hysterically.
I think the solution they went for was irreversible freeze and moisture indication stickers. Which was what I suggested they go for in the first 5 minutes of the meeting since that a) solved their problem, and b) is on the market, and c) can be had for the price point in bulk.
What does "serious" mean
(reference to a character in the Expiditionary Force series by Craig Alanson
Only a very small portion of his physical presence is in local spacetime, with the rest in higher spacetime. He can expand his physical presence from the size of an oil drum or shrink to the size of a lipstick tube. He can’t maintain that for long without risking catastrophic effects. If he did, he would lose containment, fully materialize in local spacetime and occupy local space equal to one quarter the size of Paradise. The resulting explosion would eventually be seen in the Andromeda Galaxy.)
What if your server fly over france , but not in France, hence: you don't need to build servers in france, unlike before, you don't need to deal with local government on so many issues, water, electricity etc to be local in france.
And , taxes : crypto payments + compute , and same transaction in france doesn't have to be taxed anymore :)
Yes, you have to pay taxes to US government, but not to france.
As most engineers realize right away, it is not going to be profitable to operate a regular datacenter in space, per the article (and I agree), so something else is going on here. Almost all the discussion is about feasibility, which is not by itself going to explain the situation.
It is clearly somewhat feasible to build Starlink level infrastructure and operate it profitably. I would posit that the narrative is a funding vehicle for a more conservative, incremental objective.
The very fact that the infrastructure is in space places the datacenter on the legal and geopolitical high ground. It's hard to raid servers if they are in orbit. It's hard to disable, audit, or arm-wrestle into submission. It doesn't have to have the scale we've come to expect in 2026 to be useful. And it's for inference, not training, of course. Useful levels of inference is computationally cheap. There are implications with the financial system as well.
In combination with PLTR technology, what I see is another intelligent and strategic move by Musk to enable and be part of hegemony. He is a central player not making decisions in isolation. They are playing a game with different rules, and therefore different unit economics.
In Spain, 1kWp of solar can expect to generate about 1800 kWh per year. There's a complication because seasonal difference is quite large - if we assume worst case generation (ie what happens in December), we get more like 65% of that, or 1170 kWh per year.
That means we need to overbuild our solar generation by about 7.5x to get the same amount of generation per year. Or 7.5kWp.
We then need some storage, because that generation shuts off at night. In December in Madrid the shortest day is about 9 hours, so we need 15 hours of storage. Assuming a 1kW load, that means 15kWh.
European wholesale solar panels are about €0.1/W - €100/kW. So our 7.5kWp is €750. A conservative estimate for batteries is €100/kWh. So our 15kWh is €1500. There's obviously other costs - inverters etc. But perhaps the total hardware cost is €3k for 1kW of off-grid solar.
A communications satellite like the Eurostar Neo satellite has a payload power of 22 kW and a launch mass of 4,500 kg. Assuming that's a reasonable assumption, that means about 204kg per kW. Current SpaceX launch costs are circa $1500 per kg - but they're targeting $100/kg or lower. That would give a launch cost of between $300k and $20k per kW of satellite power. That doesn't include the actual cost of the satellite itself - just the launch.
I just don't see how it will make sense for a long time. Even if SpaceX manage to drastically lower launch costs. Battery and solar costs have also been plummeting.
https://www.spaceconnectonline.com.au/manufacturing/4751-air...
https://www.nextbigfuture.com/2025/01/spacex-starship-roadma...
It was impossible in the sense that nobody else did it before. It was not impossible as in you need to violate basic laws of Physics or elementary Economics.
Before reusable rockets, the idea made sense. Building a rocket is expensive; if we reuse we don’t have to keep spending that money. Fundamentally, rockets are rockets. It’s not like they invented anti-gravity or anything.
It’s like climbing the Everest. Before it was done, it was still something people could plan and prepare for. But you’re not going to climb all the way to the moon, even with oxygen bottles. It’s a completely different problem to solve.
The most difficult point to argue against for people who want to defend Musk’s delusions is simple economics: at the end of the day, when you’ve solved
- the energy source problem (difficult but probably doable);
- the radiation-resistant chips issue (we know we can do it, but the resulting chip is not going be anywhere near as fast as normal GPUs on Earth);
- the head dissipation problem (physically implausible, to be charitable, with current GPUs, but considering that a space-GPU would have a fraction of the power, it would just be very difficult);
- the satellite-to-satellite communication issue, because you cannot put the equivalent of a rack on a satellite, so you’d need communication to be more useful than a couple of GeForces (sure, lasers, but then that’s additional moving parts, it’s probably doable but still a bit of work);
- the logistics to send 1 million satellites (LOL is all I can say, that’s a fair number of orders of magnitude larger than what we can do, and a hell of a lot of energy to do it);
- and all the other tiny details, such as materials and logistics just to build the thing.
Then, you still end up with something which is orders of magnitude worse and orders of magnitude more expensive than what we can already do today on Earth. There is no upside.
It does not make sense.
The question isn't "can you mitigate the problems to some extent?", it's "can you see a path to making satellite data centers more appealing than terrestrial?"
The answer is a flat out "no," and none of your statements contradict this.
Terrestrial will always be better:
1. Reducing the cost of launches is great, but it will never be as cheap as zero launches.
2. Radio transmissions have equally high bandwidth from Earth, but fiber is a better network backbone in almost every way.
3. Radiation events don't only cause unpredictable data errors, they can also cause circuit latch-ups and cascade into system failure. Error-free operation is still better in any case. Earth's magenetosphere and atmosphere give you radiation shielding for free, rad-hard chips will always cost more than standard (do they even exist for this application?), and extra shielding will always cost more than no shielding.
4. On Earth you can use conduction, convection, AND radiation for cooling. Space only gets you marginally more effective radiation.
5. Solar is cheaper on the ground than in space. The increase in solar collection capability per unit area in space doesn't offset the cost of launch: you can get 20kW of terrestrial solar collection for around the price of a single 1U satellite launch, and that solar production can be used on upgraded equipment in the future. Any solar you put on a satellite gets decommissioned when the inference hardware is obsolete.
And this ignores other issues like hardware upgrades, troubleshooting, repairs, and recycling that are essentially impossible in space, but are trivial on the ground.
Lag for roundtrip: 35ms. But when satelite needs to pass through other satellites as has no ground coverage you add more lag and reduce bandwidth of the whole network.
The best part is jurisdiction safety. Very hard to get raided by govs.
[1] https://www.nlr.gov/news/detail/features/2021/scientists-stu...
Radiators works almost just as well on Earth. Convection and conduction more than make up the difference.
This statement is actually completely false. The bottleneck is not cost of building data centers, but the energy accessible on the planet. How much we're willing to pay for increasing that is currently very unclear, but it's far more than the current cost of building a terrestrial data center.
As Jensen Huang famously touted their performance per watt, saying "Our customers won't buy our competitor's chips even if they were free."
There's also the coolness factor, I guess.
But why does no one talk about launching RackSpace servers into space? I think the whole thing is tied to AI because of the hype, not because sending servers into space has any kind of material advantages.
No, because of the costs of acquiring land that the railway goes through.
How much of energy will it take to launch the same amount of compute, connectivity, and PV to power it into space?
A data center is nowhere near that and requires constant physical interventions. How do they suggest to address this?
It's like his "Mars Colony" junk - and people lap it up, keeping him in the news (in a not explicitly negative light - unlike some recent stories....)
Anywhere on earth is better than space for this application.
I was poorly trying to raise this trite distinction, asserting skepticism falls closer to Opinion than Journalism. The line gets more fine every day. I know. Take it up with them/their peers.
'Rigorous' would be "Billionaire says '<crazy shit>'", not "Billionaire says '<crazy shit>'... and here's how we feel/think about it".
- You have to size your cooling towers for your hottest hour. Doing this saves you no capital costs.
- You barely have to run the fans on your cooling towers in the winter because the air is so cold. So often this also won’t save you much operating costs.
- Already there is an essentially unlimited amount of so called “waste heat” from power plants and factories. Building district heating systems is extremely capital intensive, which is why this isn’t done more.
- As a municipality it’s just a horrible idea to make the heating system of your whole city rely on a random company continuing to operate (even worse if said company is in a potential bubble). This is why most district heating systems work with power plants - they already have the government involved in ensuring their continuing operations.
Too bad the fire trucks can't get to you when you catch on fire from that hot GPU.
To be fair though, there is a lot of tech that to me seems like complete magic and yet it exists. SDR for instance, still has me baffled. Who ever thought you'd simply digitize the antenna signal and call it a day, hardware wise, the rest is just math, after all.
When you get used to enough miracles like that without actually understanding any of it and suddenly the impossible might just sound reasonable.
> Can't you do something creative? We heard you were clever.
Should be chiseled in marble.
https://climatecosmos.com/sustainability/how-close-are-we-to...
“The reason I concentrate my research on these urban environments is because the composition of soiling is completely different,” said Toth, a Ph.D. candidate in environmental engineering at the University of Colorado who has worked at NREL since 2017. “We have more fine particles that are these stickier particles that could contribute to much different surface chemistry on the module and different soiling. In the desert, you don’t have as much of the surface chemistry come into play.”
I'd say less than a third.
The biggest problem folks had was even with equipment with 99.9% reliability something breaks every day due the huge raw number of devices involved. And most network equipment is not any where close to being radiation hardened.
I had some fun with it with Bezo’s fist bumping folks because SpaceX was cleaning BlueOrigin clock.
I talked to one of their lawyers and didn’t hear anything afterwards. I left AWS and a couple of years later Amazon announced AWS ground station. I wonder how much my paper contributed to green lighting that project.
X failing and can't pay its debts? Welp, better give him a government bailout otherwise no more rockets for you!
I still think a lot about the failed OpenAI coup, and how different things would be now if Microsoft hadn't backed Altman. Would this hype cycle and bubble grown so ridiculous if there were more conscientious people in charge at the front-runner? We will unfortunately never know. I really wish that board had planned out their coup better.
(Space doesn’t help in cooling GPUs in a satellite - space makes cooling worse)
Yeah, space is cold, but also you don't have access to large thermal masses with which to exchange heat, so the fact that space is cold does not help much.
In space the only option for cooling is large radiators. If you had a data center in space you'd need enormous radiators -- much larger than the data center itself.
(On Earth we can exchange heat with the environment, and the environment includes convection and the water cycle and ultimately can expel excess heat via high altitude condensation of water vapor where most of the heat released escapes to space. As well clouds can both block insolation as well as keep heat below trapped, but altogether between high altitude condensation and blocking insolation this is the mechanism by which Earth keeps its temperature as a random walk around the average that we enjoy.)
e.g. the lack-of-a-thing that makes a thermos great at keeping your drink cold too
I'm pretty his point is that while cooling is an impossibility, it is not the only one!
Back in the early 1990s I read some children's futurist book that suggested that we might send solar panels to space that would then beam energy via microwaves to the surface. The book was more fantasy than science, so I took it with a huge grain of salt and appreciated it for its entertainment value.
But do you think schemes that try to direct solar energy to the surface are more practical then running datacenters in space?
> As conduction and convection to the environment are not available in space, this means the data center will require radiators capable of radiatively dissipating gigawatts of thermal load. To achieve this, Starcloud is developing a lightweight deployable radiator design with a very large area - by far the largest radiators deployed in space - radiating primarily towards deep space...
They claim they can radiate "633.08 W / m^2". At that rate, they're looking at square kilometers of radiators to dissipate gigawatts of thermal load, perhaps hectares of radiators.
They also claim that they can "dramatically increase" heat dissipation with heat pumps.
So, there you have it: "all you have to do" is deploy a few hectares of radiators in space, combined with heat pumps that can dissipate gigawatts of thermal load with no maintenance at all over a lifetime of decades.
This seems like the sort of "not technically impossible" problem that can attract a large amount of VC funding, as VCs buy lottery tickets that the problem can be solved.
That's why I said I actually don't think it's realistic in my post. He might be right, but some of his reasons are wrong.
[1] https://lilibots.blogspot.com/2020/04/starlink-satellite-dim...
We use them because they're many orders of magnitude cheaper and simpler for anywhere near the same bandwidth for the distances required.
Fair point that in SSO you'd need 2-3x the radiator area (and half the solar panels, and minimal/no batteries). I don't think that invalidates my point though.
The digital end of SDRs are simple. Sample it, then once you have trapped the signal in digital form beat the signal into submission with the stick labeled "linear algebra".
(Nevermind that the math may be demanding. Math books are nowhere near as scary as the Sacred Texts Of The Dark Wizards)
"Rohde & Schwarz — live at the VNA, 96 dB dynamic range, one night only."
That had me laughing out loud, you should have left the name out to make it more of a puzzler :)
I apparently have been drawn to the occult for a long time and feel more comfortable with coils, capacitors and transmission lines than I do with the math behind them. Of course it's great to be able to just say 'ridiculously steep bandpass filter here' and expect it to work but I know that building that same thing out of discrete components - even if the same math describes it - would run into various very real limitations soon.
And here I am on a budget SDR speccing a 10 Hz bandfilter and it just works. I know there must be some downside to this but for the life of me I can't find it.
Sounds a bit like that Dilbert where the marketing guy has sold a new invisible computer and is telling the engineers to now do their job and actually make it.
Is it reasonable to use Neo as a baseline? Modern Starlink satellites can weigh 800kg, or less than 20% of Neo. I see discussions suggesting they generate ~73kw for that mass. I guess because they aren't trying to blanket an entire continent in signal? Or, why are they so much more efficient than Neo?
Interestingly the idea of doing compute in space isn't a new one, it came up a few years ago pre-ChatGPT amongst people discussing the v2 satellite:
https://forum.nasaspaceflight.com/index.php?topic=58374.msg2...
Still, you make good points. Even if you assume much lighter satellites, the GPUs alone are very heavy. 700kg or so for a rack. Just the payload would be as heavy as the entire Starlink satellite.
You cannot put a power station in the middle of a city centre, you can put a datacentre there. The main reason this isn't done more is that it's expensive to build heat network between the 'far out of town industrial area' where they put the heat sources and the city centre where the heat consumers are.
I don't know why a municipality is involved, but regardless you can simply install a backup heat source and/or add a mix of heat suppliers to the network. Backup gas boiler or similar is not that problematic or expensive to add particularly because you don't need to add redundancy as it's just there for a backup scenario.
And it would be helpful if you showed some uses of superconductors in space similar to what you propose and not some vague proposal for research that would take decades to realize. I'm not familiar with any use of them relevant to this application and I take the other people responding to you are not either.
But SpaceX has lots of real engineers who are very smart. I’m certain they ran the math on it. Which is more than you or I have done.
If they say it can be done, I’m inclined to believe them.
https://caseyhandmer.wordpress.com/2019/08/20/space-based-so...
I would love it to be a thing, but it is not a thing.
They have to solve for it being cheaper to launch and operate in space vs building and operating a datacenter with its own power generation on Earth.
What radiators look like is foil or sheet covering fluid loops to spread the heat, control the color, and add surface area.
In general, radiators are white because there's no reason for them to absorb visible light, and they're not hot enough to radiate visible light. You want them to be reflective in the visible spectrum (and strongly absorptive/emissive in the infrared).
A white surface pointing at the sun can be quite cool in LEO, < -40C.
They are usually white, because things in a spacecraft are not hot enough to glow in visible light and you'd rather they not get super hot if the sun shines on them.
The practical emittance of both black paint and white paint are very close to the same at any reasonable temperature-- and both are quite good, >90% of this magical material that you cite ;)
Better materials -- with less visible absorption and more infrared emittance -- can make a difference, but you still need to convect or conduct the heat to them, and heat doesn't move very well in thin materials as my sibling comment says.
The graphene radiator you cite is more about active thermal control than being super black. Cheap ways to change how much heat you are dumping are very useful for space missions that use variable amounts of power or have very long eclipse periods, or what move from geospace to deep space, etc. Usually you solve it on bigger satellites with louvers that change what color they're exposing to the outside, but those are mechanical parts and annoying.
I mean why think about anything, you know. Critical thinking is for losers, am I right?
There’s so much overhead you’re hand waving away to make your numbers work.
> I would assume the people designing this are "very careful" with everything they put in the data center
Which is very nice for Musk, who can spend 30 seconds running his mouth, and people jump to assuming that a) it's being designed, b) by skilled people, c) the math and finances works out already, d) that 'completely obvious' problems must simply be your lying eyes, and contort themselves to put all the effort into defending it.
Even though Musk has a history of lying announcements and not being able to deliver and the 'completely obvious' problems were actually problems that nobody solved. Where is the 2017 full self driving car? Where is the Vision-over-LIDAR success? Where is the Hyperloop that "would be able to whisk passengers from L.A. to San Francisco in just 35 minutes"? Where are the 2025 orbital refuelling test flights for the Moon and Mars schedule, and the plans for how to keep cryogenic liquid Hydrogen cold in Space? Where was the "funding secured" Musk lied about for taking Tesla stock private in 2018 when judges found there wasn't any funding and fined him $20M? Where's the person Musk said in 2011 he could "put on Mars in a decade"? Where's the uncrewed Mars ship in 2022 he announced in 2017? The human voyage in 2024?
> "I'm a physicist myself"
And if someone tells you they have found a quantum zero-point free energy room temperature superconducting over-unity perpetual motion machine, do you jump to their defense because you assume the speaker must be very careful and smarter than everyone else? Or do you say "sounds unlikely; extraordinary claims require extraordinary evidence"?
> "I suppose they could make something like the International Space Station, which would get regular traffic back-and-forth exchanging and servicing hardware as needed."
The ISS cost 100-150 billion, is "larger than a 6 bedroom house", and its solar panels can generate 250 kW. NVidia says their AI datacenter costs $50-60 billion, needs 1GW of electricity, and look at the size of it: https://www.businessinsider.com/why-nvidia-worth-5-trillion-...
You're looking at that multiple-warehouses-structure which could sink the output of an entire nuclear power station, and going with "it would be cheaper if we launched that into space"?
One thing to think about is debt which is not in terms of money.
People are becoming more familiar with "technical debt" since otherwise it comes due by surprise.
With hamsterwheels in space you've got energy debt.
Separate from all other forms of debt that are involved.
Like financial debt, which is only a problem if you can't really afford to do the project so you have to beg, borrow, and/or steal to get it going.
On that point I think I'd be a little skeptical if the richest known person can't actually afford this easily. Especially if he really wants it with all his heart, and has put in any worthwhile effort so far.
Anyway, solar cells are kind of weak when you think about it, they don't produce the high output of a suitable chemical reaction, like the kind that launches the rockets themselves. Which releases so much energy so fast that it's always going to take a serious amount of time for the "little" solar cells to have finally produced an equal amount of energy before a net positive can begin to accrue.
Keeping the assets safely on the home planet simply provides a jump-start that can not be matched.
All other things being unequal or not.
So the total heat load if 4 MW (of which 1 MW was temporarily electrical energy before it was used by the datacenter or whatever).
Let's assume a single planar radiator, with emissivity ~1 over the thermal infrared range.
Let's assume the target temperature of the radiator is 300 K (~27 deg C).
What size radiator did you need?
4 MW / (5.67 * 10 ^ -8 W / ( m ^2 K ^4 ) * 300 K ^4) = 8710 m ^2 = (94 m) ^2
so basically 100m x 100m. Thats not insanely large.
The solar panels would have to be about 3000 m ^2 = 55m x 55m
The radiator could be aluminum foil, and something amounting to a remote controlled toy car could drive around with a small roll of aluminum wire and locally weld shut small holes due to micrometeorites. the wheels are rubberized but have a magnetic rim, on the outside theres complementary steel spheres so the radiator foil is sandwiched between wheel and steel sphere. Then the wheels have traction. The radiator could easily weigh less than the solar panels, and expand to much larger areas. Better divide the entire radiator up into a few inflatable surfaces, so that you can activate a spare while a sever leak is being solved.
It may be more elegant to have rovers on both inside and outside of the radiator: the inner one can drop a heat resistant silicone rubber disc / sheet over the hole, while the outside rover could do the welding of the hole without obstruction of the hole by a stopgap measure.
Also I'm astounded how important AI data centers are when we are running out of freshwater, to mention a thing we could easily solve with focusing our efforts on it instead of this. But yeah, surely the Space AI Data Centers (aka. "SkyNet") is the most important we must build...
Also this is just about Elon jumping the shark...
Maybe there's a very latency sensitive need to send realtime targeting information to a tomahawk missile in flight? But it's also too bandwidth, compute or cost intensive to send a firehose of raw spy-satellite data to a disposable one-way attack munition?
The data centers in space are actually for the spy satellites to use. That's all I got for practical applications.
On the other hand Starlink has several thousand satellites up there using solar power to run processors and cooling them with radiators so it's not totally new technology.
Here's a Musk tweet linking some analysis https://x.com/elonmusk/status/2013676764099199156
Computers aren't humans. High-performance silicon can comfortably operate at a junction temperature of 80C to 90C (approx. 360K). Because of that T^4 relationship, a radiator at 85C rejects nearly double the heat per square meter than a radiator at 20C, unless I miss something.
So this makes it a bit more nuanced.
But because that's fiction, Vinge can just handwave away all the hard engineering problems for sci-fi flavor.
The Solar Load is Directional: Unlike a terrestrial atmosphere where heat is omnidirectional, space allows for "shadow engineering." A simple multi-layer insulation (MLI) sunshield can reduce solar flux by orders of magnitude. We do this for the James Webb Space Telescope to keep instruments at 7K while the sun-facing side is at 380K. For a data center, you don't need 7K; you just need to keep the "dark side" radiators in the shade.
>Uhhhh
Thanks, I wouldn't have noticed how wrong that was otherwise ;)
It's most certainly two of them.
When you boil it down though, sometimes more than one company is built using almost the same exact mold, and the only major difference between them is the idea that the business plan is bult around.
More profitable ideas are good to have.
High-functioning or not.
As I've pointed it out to you elsewhere -- how do you couple the 4MW of heat to the aluminum foil? You need to spread the power somewhat evenly over this massive surface area.
Low pressure gas doesn't convect heat well and heat doesn't conduct down the foil well.
It's just like how on Earth we can't cool datacenters by hoping that free convection will transfer heat to the outer walls.
Even if it's more expensive, Spacex will be able to deploy hardware when no one else can because all the gas turbines and existing power plants have been exhausted and the lead time to build new ones is 5+ years out because of the bureaucratic overhead.
Nowadays such microwave power amplifiers should be made with gallium nitride transistors, which should allow better efficiencies than the ancient amplifiers using LDMOS or travelling-wave tubes, and even those had efficiencies over 50%.
For beamformers, there have been research papers in recent years claiming a great reduction in losses, but presumably the Starlink satellites are still using some mature technology, with greater losses.
PS. I think the authors argument that millions of satellites might run into each other is silly. There are like 1.5 B cars.
It never fails here. Ya'll are soooo determined to assume ulterior motivations. He has always been direct about his motivations, whether it's about politics or business decisions.
To suspect his whole plan for datacenters in space is a ruse or something to drive up some stock price (or whatever), is... just ridiculous. You really think they person who leads SpaceX (more satellites than the rest of the world combined) and Xai (with a competitive frontier model in 2 years starting from scratch), and Tesla (more inference compute than any company on Earth) really knows less than you about the math and physics of this idea??
His immediate focus for Starship has shifted from Mars colonisation to exponential expansion of intelligence, as he thinks it's the best path to extend consciousness. Ridiculous or not, he believes that, and that's the motivation.
Lets assume you truly believe the difficulty is the heat transport to the radiator, how is it solved on earth?
Not my downvote, I know what you mean.
Much rather live way out in the boonies, as far away from civilization as possible.
Oh wait . . .
Wouldn't a simpler explanation be that SpaceX is making a lot of money while xAI is losing a lot. If funds have to flow through Elon personally it is likely complicated and costly. Also, if the "space data center" idea is actually workable (I have no idea if it is) then it does make some logical sense as well. Of course, Twitter just seems like kind of a write off to me at this point.
1) The heat can be transported by a heat carrier conducting heat standing still.
2) The heat can be transported by a heat carrier in motion.
3) The heat can be transported by thermal radiation.
The first 2 require massive particles, the latter are spontaneous photons.
A thermos bottle does not simply work by eliminating the motile mass particles.
Lets consider room temperature as the outer thermos temperature and boiling hot water as the inner temperature, that is roughly 300 K and 400 K.
Thermal radiation is proportional to the fourth power of temperature and proportional to emissivity (which is between 0 and 1).
Lets pretend you are correct and thus thermally blackened glass (emissivity 1) inside the vacuum flask would be fine according to you. That would mean that the radiation from your tea to the room temperature side would be proportional to 400^4 while the thermal radiation from room temperature to the tea would be proportional to 300^4. Since (400/300) ^ 4 = 3.16 that means the heat transport from hot tea to room temperature is about 3 times higher.
If on the other hand the glass was aluminized before being pulled vacuum the heat transports are proportional to 0 * 400 K ^ 4 and 0 * 300 K ^ 4 . So the heat transport in either direction would be 0 and no net heat transport remains.
If you believe the shiny inside of your thermos flask is an aesthetic gimmick, think again.
You are making a non-comparison.
Imagine comparing a diesel engine car to an electric car, but first removing the electric motor. Does that make a fair comparison???
It's both. You have to spread a lot of heat very evenly over a very large surface area. This makes a big, high-mass structure.
> how is it solved on earth?
We pump fluids (including air) around to move large amounts of heat both on Earth and in space. The problem is, in space, you need to pump them much further and cover larger areas, because they only way the heat leaves the system is radiation. As a result, you end up proposing a system that is larger than the cooling tower for many nuclear power plants on Earth to move 1/5th of the energy.
The problem is, pumping fluids in space around has 3 ways it sucks compared to Earth:
1. Managing fluids in space is a pain.
2. We have to pump fluids much longer distances to cover the large area of radiators. So the systems tend to get orders of magnitude physically larger. In practice, this means we need to pump a lot more fluid, too, to keep a larger thing close to isothermal.
3. The mass of fluids and all their hardware matters more in space. Even if launch gets cheaper, this will still be true compared to Earth.
I explained this all to you 15 hours ago:
> If this wasn't a concern, you could fly a big inflated-and-then-rigidized structure and getting lots of area wouldn't be scary. But since you need to think about circulating fluids and actively conducting heat this is much less pleasant.
You may notice that the areas, etc, we come up with here to reject 70kW are similar to those of the ISS's EATCS, which rejects 70kW using white-colored radiators and ammonia loops. Despite the use of a lot of exotic and expensive techniques to reduce mass, the radiators mass about 10 tonnes-- and this doesn't count all the hardware to drive heat to them on the other end.
So, to reject 105W on Earth, I spend about 500g of mass; if I'm as efficient as EATCS, it would be about 15000g of mass.
You cannot do two things at the same time:
1. Make electronics small. 2. Make electronics radiation resistant.
It’s a numbers game. The denser things are packed, the higher the probability that a random high energy particle or ray will damage something.
20 years ago NASA was buying old chips, because those were less susceptible, modern “radiation hardened by design” chips are better than those, but still slower than those for planetary use.
Using higher heat to raise lower heat is just the most simple case.
But purpose isn't relevant to this constraint, it is a physics constraint. Regardless of purpose, you can't extract useful energy from heat without a heat difference to work with. (And without a heat difference, even "heating" with heat doesn't do anything.)
And it still doesn’t solve the problem of a cascade causing shrapnel density to increase in an orbit shell which then causes satellites to use some of their scarce maneuver budget to avoid collision. But as soon as a satellite exhausts that budget, it becomes fodder for the shrapnel cascade.
You've imagined an argument so you can dunk on it to appear superior.
In addition, thermoses aren't made of glass. It is far more common to make them out of steel or aluminum.
It really is as simple as just adding kilometers of radiatiors. That is, if you ignore the incredible cost of transporting all that mass to orbit and assembly in space. Because there is quite simply no way to fold up kilometer-scale thermal arrays and launch in a single vehicle. There will be assembly required in space.
All in all, if you ignore all practical reality, yes, you can put a datacenter in space!
Once you engage a single brain cell, it becomes obvious that it is actually so impractical as to be literally impossible.
Yes 20 and 25°C I believe are the two most popular choices. In many cases it makes little difference with units in Kelvin ¯\_(ツ)_/¯
None of the big-box stores have created a monopoly.
Amazon unseated behemoth Walmart with a mere $300,000 startup capital.
Musk founded his empire with $28,000.
But I don't really see how that is relevant to the question of using waste energy to heat homes. We don't have ideal Carnot machines so there's always energy wasted, which most of the time is still good enough for residential heating.
* They assume 1 satalite = 1 GPU. This is quite funny, actually. A single H200 floating in space with a solar panel and an antenna. In reality, a satellite would pack as many chips as the heat/power allows. A Starlink-sized satellite should be able to hold 40 or so chips. There's no reason why a larger satellitte couldn't hold, say, 1024. * They mention training, but sampling is what makes sense here. Training is a different beast, and requires high reliability, high bandwidth, low latency, and a lot of IO. Space would not be ideal for this. I'd expect training to remain terrestrial and just do sampling in space. (FWIW, sampling will be most of the compute allocation). * Also, no one upgrades GPUs in datacenters, they just add new nodes and leave the old ones there. Google still has their P100 nodes running. Not being able to fix them, though, is a significant concern.
For example - richard stallman is pedantically correct about many things regarding licenses or privacy or any number of related subjects. But nobody can wholeheartedly accept and adopt his viewpoint and behave as he does (no phone, doesn't use non-free software, etc)
Musk is similar in his promises and predictions. Nobody can wholeheartedly accept his views.
But the reason these folks are valuable are - they move the goalposts. Moving the goalposts moves the thoughts and behavior of people close to their viewpoints, and can eventually unseat the complacent middle.
imho :)
EDIT: I think nobody is immune to this. Lots of people will understand the bullshit is deep when someone comes up to them and relentlessly over-the-top flatters them. But they are likely to listen to and accept the person, logic be damned.
... hooked up to the ISS, with humans in attendance to fix anything that goes wrong... not doing very much.
It's akin to the difference between a boat moored up in a port, and an autonomous drone in the middle of the Pacific. Aside from that, satellites have to maneuver in orbit (to stay in the correct orbit, and increasingly to avoid other satellites). Hefting around additional kgs of shielding makes that more difficult, and costly in terms of propellant, which is very important for the lifetime of a satellite.
If you're just building solar panels and using batteries you don't need grid approval to build it and connect it to your own datacenter. The same is true if you're wanting to just use natural gas to a large extent, although you'll have more regulations regarding environmental emissions. But you'll get that when you're trying to get a million space launches approved as well.
Elon has already built tons of data centers here on earth. He knows how to build them quickly. People even build them in tents these days.
- Reusable rockets have been a thing since the Space Shuttle in 1981, building on a 1969 plan for reusable space vehicles. - https://en.wikipedia.org/wiki/Space_Shuttle
- Autonomous cars: human chauffeurs and taxis (and trains) so we can be moved around without doing the driving, go back to the first cars. We haven't had the technology to build them (and arguably don't and won't have until we get near AGI).
- Data centers in space ... ???? Bueller? Bueller?
- Humanoid robots were seen in Fritz Lang's Metropolis film in 1927, they've always made sense. What doesn't make sense is lying about having built humanoid robots and then having to admit they were being remote controlled, cough Tesla.
And you still haven’t provided a source for your claim.
At earth or above sea, we use cooling to maintain the temperature below 60 degrees, or 80 or 100 or something.
Shadow of space is -157 degrees, the cooling design will be different.
Literally Goethe's Faust (A Tragedy, Part I) .. you're good unless a poodle transforms into Mephistopheles on your deathbed.
Well acttshually, it's 100% efficient. If you put 1W in, you will get exactly one watt out, steady state. The resulting steady state temperature would be close to watts * steady state thermal resistance of the system. ;)
I don't think you could use "efficiency" here? The math would be based on thermal resistance. How do you get a percentage from that? If you have a maximum operating temperature, you end up with a maximum operating wattage. Using actual operating wattage/desired operating wattage doesn't seem right for "efficiency".
The conversation was about harnessing energy, from heat, in orbit.
Heat pumps take energy to move energy. But you can't power the heat pump from the heat it is already pushing against the heat gradient.
Waste heat can be used, if there is a difference in heat to work across, but not if there isn't. A datacenter in Antarctica could recover energy from waste heat, against the freezing outdoor temperatures.
In orbital systems, the problem is getting rid of heat, so there isn't some cold place to use to create a heat gradient and harvest energy. Space is cold, but particles are so diffuse they have little heat energy capacity, so essentially a heat insulator, and not useful to create a gradient. Thus the use of radiators.
To be clear I’m not advocating KSP as a reality simulator, or that data centers in space isn’t totally bonkers. However the reality is the hotter the radiator the smaller the surface area for pure radiance dissipation of heat.
Why not do the obvious comparison with terrestrial data centers?
Imagine a liquid which can be electrically charged, and has a low boiling point.
(Ask 3M/DuPont/BASF/Bayer... - context 'immersion cooling')
Attach heat-pipes with that stuff to the chips as is common now, or go the direct route via substrate-embedded microfluidics, as is thought of at the moment.
Radiate the shit out of it by spraying it into the vacuum, dispersing into the finest mist with highest possible surface, funnel the frozen mist back in after some distance, by electrostatic and/or electromagnetic means. Repeat. Flow as you go.
During the day or night, it will never be overhead.
Wouldn't even need to be that 'autonomous', since the installation is fixed.
More like the things simulating fireworks with their LEDs in preprogrammed formation flight over a designated area.
The article itself said the maximum was 50% and it was significantly less of a problem in the desert. Even 50% still beats space by miles, that only increases per kWh cost by ~2c the need for batteries is still far more expensive.
So sure I could bring up other sources but I don’t want to get into a debate about the relative validity of sources etc because it just isn’t needed when the comparison point is solar on satellites.
