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I think a lot of the desire to become a two planet species dwindled at the close of the cold war. Without the constant threat of nuclear annihilation it just didn't seem as important to people. I agree that we are going to need to diversify if we want human life to keep going, Planets and solar systems. I wonder what will happen when AI gets to the point of being self realized, it could expand to reaches that just aren't in the picture right now for humans.