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The only reasons to colonize space are because of a scarcity of resources, room or tolerance, or because it becomes negligibly easy. Of course, as the technologies develop, the price of space travel falls so it becomes a much easier business case to make. I don't want to derail this thread, but this is why I'm excited by private space businesses beginning to crop up; you get real development when a broad swath of people (not just governments) are tinkering and experimenting, and more development means cheaper prices.
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