Well, if we ever get a moon base, it might eventually allow construction of observatories the size we have on Earth, but without the atmosphere. Sure, it will probably be a long time before that happens, but the big deal about Hubble isn't the size/quality, it's the fact that there's no atmosphere in the way. So if we start getting 20 or 30 foot mirrors on the moon, that will blow away anything we have now.
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