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I’m not sure that fitting Earthlike habitats in giant spaceships would make sense without limitless exponential growth. Wouldn’t it be more feasible to put something on the surface of a planet?
No matter how advanced our technology gets, we are not going to get around the basic constraints on energy.
Hopium huffers will smugly chant “asteroid mining!” as the answer to your questions, in much the same way that “monorail!” was chanted during that one Simpsons episode.