Comment Re:But Elon! (Score 2) 39
Solar panels in low earth orbit get only about 5x as much power per square meter as solar panels on the ground. A modern AI data center uses upwards of 1 gigawatt of power. In low earth orbit, at 1.361 kW irradiance per square meter, even if your solar panels were 100% efficient, a data center would need 735,000 square meters of solar panels, or almost 1.5x the size of Vatican City, or 137 football fields, or...
Mind you, presumably an in-space data center would be broken into hundreds or thousands of satellites operating together, but the largest in-space solar array ever built is only 3,244 square meters, and that's on ISS, and was assembled by people over many *years*. (The original was 2500 square meters, and it took eight years to expand it to 3,244.) Even if you divide that a thousand times, it would still be about three times as big as the largest solar array ever deployed automatically from a satellite (as opposed to being built in space like ISS).
And real-world panels are only about 30% efficient, so multiply those numbers by three.
I'm not saying it's impossible, because it isn't, but even if we optimistically assume that a launch can lift 1,000 square meters of panels (4x the monster satellites SpaceX is planning), you're talking about 2,200 launches for the panels alone, and probably at least 20,000 launches for the trusses to hold them. Even if SpaceX's peak launch rate of 3 per day is sustainable, a single data center would still take well over two decades to build. And this is probably optimistic by a factor of two to four.
So not impossible, just completely and utterly infeasible without multiple-order-of-magnitude improvements in efficiency.
This is not to say that having that sort of capacity in space won't be useful for certain purposes. The planned SpaceX satellites are supposedly going to have solar arrays of 250 kW, which is enough to power basically a single rack in an AI data center, so if that's enough compute power for you, great. But realistically, you're more likely to see data centers in space powered by nuclear power than solar power, assuming politics allows that to happen. The size requirements just don't work without being able to spread the panels out on the ground over many miles.