It's the huge gravity well of Earth and the lesser one of the Moon that will keep people off the Moon. Rockets are expensive; most of the weight of a launch goes into fuel and boosters that are completely used up. Payloads are small and the dollar-per-pound cost is enormous. Putting a single human in orbit costs tens of millions of dollars.
Two engineers have an idea for creating a much cheaper approach to beating the gravity wells. Their target is to bring costs down enough to make the Moon a second permanent home for humanity. Trips to Earth orbit have to be cheaper, but that's only a start of their ideas to make life on the Moon sustainable.
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