alt Hacker NewsYeah, I agree. A massive radar network, passive or active is the most likely possibility I have come across. You'd need a LOT of compute at each node to get the most out of the network. I found this video[1] to be a pretty convincing analysis of the absolute max capability you could expect, and it would indeed be impressive.
Well, that likely already exists as Starshield - not to mention all the pubmic SAR sats everyone has by this point.