Life on Earth has been around for, what, about 3 billion years? It has been projected that in about a billion more years, all of Earth's oceans will evaporate. I assume most life will succumb. So, we're already about 3/4 of the way through the period of life on Earth. tick tock
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I think you have to just send the ships to systems with earth-sized star planets and assume they'll all die eventually if none of them are terrestrial
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Ideally, you would perfect fully artificial habitats in Sol system first (that only need asteroids/gas giants/whatever for feedstocks), then send those. No planet, no problem.
End of conversation
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