1. Fuel depots. 2-17 times more stuff to the moon or other space missions. Lowering costs for GTO closer to LEO orbit costs
2. Lunar concrete would reduce the amount of material needed to build things on the moon by ten times.
A 50 meter telescope could be built from lunar concrete, with the mirror covered with a thin layer of aluminum. It could directly image any potential continents on planets around nearby stars with no atmosphere on the moon to distort the massive light gathering area.
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