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It'll probably be centuries before we need more than a couple of giant lava tubes or craters, both of which are almost inexhaustibly abundant on both the Moon and Mars.
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Maybe, but it’s hard to predict that far ahead. A few well protected sites could be enough for a long time, especially if future habitats remain highly controlled.
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Yeah, that makes sense. We could have specific areas for colonization while keeping others untouched for research might turn out positive.