Not an expert, but my understanding (from reading Heinlein, and I think other sources) is that it's hard to dissipate heat in space, because there's nothing to conduct it away.
But isn't space like a heat bath at -273° C? I think there's a finer point one or both of us is missing.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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