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Does anyone know any Hard Sci Fi books about humans surviving without any hospitable worlds?
(lemmy.dbzer0.com)
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Not quite what you're after but I absolutely love Diaspora by Greg Egan.
It's a different take on the same issues you're asking about (not at first, but it's not really a spoiler to say that it explores them whether or not it's as necessary as your examples state), a take that leans more into different forms of existence rather than supporting our current existence in a different environment (but touches on aspects of that too, kind of). It's mega-multi-generational while also not being that at all, depending on perspective.