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[return to "Data centers in space makes no sense"]
1. elamje+ba1[view] [source] 2026-02-04 02:16:32
>>ajyoon+(OP)
I was talking to someone about this the other day. I was part of a team at NASA that developed a cooling system for the ISS and this whole premise makes no sense to me.

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!

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2. mike_h+TW1[view] [source] 2026-02-04 09:33:10
>>elamje+ba1
It sounds hard but it shouldn't not make sense.

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.

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3. Frankl+u22[view] [source] 2026-02-04 10:15:28
>>mike_h+TW1
> There is probably plenty of scope to optimize space radiators. It was never a priority until now and is "just" an engineering problem.

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.

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4. bborud+1b2[view] [source] 2026-02-04 11:21:43
>>Frankl+u22
That bit reminded me of someone who wanted us to design a patch the size of a small postage stamp, at most 0.2mm thick, so you could stick on products. It was to deliver power for two years of operation, run an LTE modem, a GNSS receiver, an MCU, temperature and humidity sensor and would cost $0.10. And it would send back telemetry twice per day.
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5. jacque+Mk2[view] [source] 2026-02-04 12:34:22
>>bborud+1b2
'A mere matter of engineering'.
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6. bborud+u83[view] [source] 2026-02-04 16:48:41
>>jacque+Mk2
The conversation went something like this (from memory):

- 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.

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7. jacque+5i3[view] [source] 2026-02-04 17:33:03
>>bborud+u83
That's so hilarious. I've had a couple that went in that direction but nothing to come close.

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.

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8. bborud+st3[view] [source] 2026-02-04 18:18:30
>>jacque+5i3
The purely digital neighborhood of the SDRs is much easier to explain than the analog rat droppings between the DAC/ADC and the antenna. That part belongs to dark wizards with costly instruments that draw unsettling polar plots, and whose only consistent output is a request for even pricier gear from companies whose names sound an awful lot like European folk duos.

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."

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