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I’m in the middle of reading A City of Mars, by Kelly and Zach Weinersmith, who goes over their take on the feasibility of long term habitation off world. Short answer is, it’s going to be a long time. There are a lot of questions, physically, biologically, legally, logistically, unanswered. At best, it’s going to be like building a cathedral. It’s a project for multiple generations.
I also like watching Issac Arthur’s videos on YT, and fantasize about the future. He gives a more positive spin on stuff like that.
Yeah thinking about the giant challenges of building a settlement on Mars really puts in perspective the much much much harder problem of sending people to another star system.