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No cities on the Moon: a billion tons of water is not enough for sustainability
(www.frontiersin.org)
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Maybe the terraforming plans I've heard exist for mars, where they redirect asteroids with the needed materials to crash into it over thousands of years, would work, although they would have to be real careful not to miss if it's the Earth's moon instead
It looks like it might be possible to synthesize water out of the regolith https://www.nasa.gov/missions/nasa-scientists-show-how-ingredients-for-water-could-be-made-on-surface-of-moon-a-chemical-factory/
Well that sounds like a much more practical solution
indeed