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In theory billions of people will need to go to space. Planet Earth will become over crowded eventually. If humans still exist as a species lets say in 1000 years time I'm sure more space than the earth will be required to allow everyone exist. Human's will eventually exist in different colonies I suggest. Go 10,000 years from now I'd imagine there would be 100's of colonies light years apart and 1 colony may never have meet another colony.

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16y ago

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