zlacker

>>Brajes+(OP)
"but this one was unique because it was first detected by scientists roughly three hours before impact — only the eighth time that researchers have spotted one of these space rocks before it hit."

Maybe I did not read close enough but how is it "first"?

>>tocs3+QV
The other responses actually have this a bit wrong: this was unique among "bright fireball" asteroid impacts, because before it impacted (second), it was (first) detected. "First" is referring to the order of events: detection first, impact second. Not referring to the first of its kind, or even the first detection of this asteroid. It's saying these types of impacts usually just appear in the sky without first being detected by observatories. Although it's clearly not "unique" if that's the 8th time this has happened. The article is just kinda poor quality.