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it actually is not that impossible, and in fact can be done in a form factor not that different from Starlink satellites: https://www.youtube.com/watch?v=FlQYU3m1e80

I didn't say impossible, I said not based in reality. Why would you do this? What economic advantage is gained?

The radiators on the ISS radiate maybe 200kW all up. That's _one rack_ in a normal earthbound DC.