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 mean, realistically speaking more like 1/1M and it is almost inconceivable that our descendants won't master interplanetary, buying us another 3B yrs real problem is intergalactic travel but by the time the Milky Way and Andromeda sputter out we're screwed anyway
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I don't think life on earth will ever get to another star. Distances are just too far. And yeah, intergalactic travel is near impossible
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if we wanted to just seed *some* life - even a bacterium - i'll bet we could do it by 2025 a live, fertile human being (well, preferably at least 300) is another question entirely
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Not to mention the problem of making a new planet habitable
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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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