As NASA does its best to spark an off-planet economy in low Earth orbit (LEO) before the International Space Station wears out, a new book published last week argues that a potentially lucrative source of revenue in space lies a little farther out—on the Moon. And it isn’t platinum-family metal ore or helium 3, sometimes mentioned as economic enticements for space mining. It’s water. In the book, Paul Spudis, a well-known U.S. geologist specializing in lunar science, ...


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