Enormous lava tubes from what I've read big enough to place large cities. Some of them could be as large as 1 km high inside. If we could pressurize such a structure it would be possible to put a permanent colony up there. Gravity would still be low but acceptable for long visits maybe even habitation.
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Enormous lava tubes from what I've read big enough to place large cities. Some of them could be as large as 1 km high inside. If we could pressurize such a structure it would be possible to put a permanent colony up there. Gravity would still be low but acceptable for long visits maybe even habitation.
The future is large is we can get past Trump and WWIII.
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