never really. over 55 million years? (hivelink)
If intelligent life spread from earth to other planets and moons in the solar system, over 55 million years eventually Earth is the home of the mother species, but might be utterly different cultures everywhere.
(hivelink)- over 55 million years, different communities on different planets might advance technologically at different speeds...also in terms of wisdom. tid:3309 (1) (hivelink)
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