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> We do need to be colonizing other stars within a quarter billion years or so though. The sun won't last forever!

If we don't start now, when? It's the kind of thing that you can always put off for another million years.




We should have done it a million years ago. Once we had fire and the ability to sharpen rocks, there's no excuse not to start colonizing the galaxy.


We spread as far as we could, with the technology we had at the time. Going over the next hill, over the next ocean, and so on was for the best even when we hadn't fixed all the problems at home.




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