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Anonymous
It's really an issue of building what is essentially a sphere around the moon to keep the atmosphere there. You could keep it place with massive pillars that are build into the very surface of the moon.
Although to be honest, the gains for such a system would have to very much outweigh the costs. Unless they could find a way to make it fairly self-sustaining on things like a water cycle and grow crops on a massive scale, there'd be no benefit to doing something like that.
In all honesty, I see no such need for it. Biodomes would be much more efficient, along with advances in space suits. Then again, underground bases would be far superior, given that without much of an atmosphere you have the constant danger of debris smacking into the moon. An underground base could also maintain air pressure a lot easier and (in the long run) cheaper than a biodome, with far reduced risk of space debris ruining your day.
Living on the moon on a large scale comes down to if they can find water on the moon, and how well moon dirt can grow plants. If not, it'll just be a few research colonies, a few luxury hotels for the super rich, and a refueling station on the way to Mars.
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