A giant radio telescope on the 'dark side' of the moon to let us peer into the depths of time without interference from the noisy monkeys in unit 3a ;) Ships,

A giant radio telescope on the 'dark side' of the moon to let us peer into the depths of time without interference from the noisy monkeys in unit 3a ;) Ships, structures, and anything heavy that we could avoid pulling out of earths gravity well would be big cost savers if we're putting around the solar system or putting up shop anywhere. There are also some high-energy applications that could get dicey on earth but wouldn't be too bad to setup on a neighboring geographic area with no atmosphere or food chain to worry about. Oxygen generators, habitats, water refiners, nuclear reactors... Ideally from autonomous building robots, these would be the foundation of long term habitation.