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An in-space construction firm says it can help build massive data centers in orbit
(arstechnica.com)
This is a most excellent place for technology news and articles.
So don't use rad-hardened processors, put them in a radiation vault instead. Those become more mass-efficient the more hardware you're putting inside them.
Really, I assure you the people proposing these things have put more thought and expertise into it than a bunch of random Fediverse commentators.