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Regardless of this case, how long does terraforming take on a reasonably Earth-like planet? Are we talking about decades, centuries, millennia?
Who can say? We would likely have much more advanced technology by then, so self-replicating machines could speed things up quite a bit. But it would probably take centuries afterwards for the planet to reach equilibrium. We'd have to stay in stasis through it while the machines did the work.
Regardless of this case, how long does terraforming take on a reasonably Earth-like planet? Are we talking about decades, centuries, millennia?
Humans just had two failed moon landings. Doing anything outside of earth is hard, very hard. The further away it is, the harder it is. We might not be able to that on Mars, much less some planet that we know little about 110 light years away.
I suppose the future of mankind is right here on Earth then...
I think we will at least find a place (like Mars) to temporarily settle a few dozens people. They can rotate like the ISS crew. Start small like that, and grow from there if they manage to live safely on Mars environment. It only takes a small number of people to restart the species. Yes, the vast majority of humans will stay right here on earth.
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