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 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.
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Intergalactic? Is that even necessary? Aren't there enough stars in our own galaxy to make a decent playground?
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if we're autistic enough to worry about 1B yrs from now, why not worry about when the Milky/Andromeda stars start sputtering out, too?
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Hadn't thought about that.
By then kickstarting a new galaxy may be in our successors' powers just as well as travelling to another.
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