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Even before Apollo 11 landed on the Moon, private companies were exploiting space via communication satellites--a sector that is seeing exponential growth in the internet age. In human spaceflight, too, commercialization is making itself felt. Billionaire entrepreneurs Elon Musk, Jeff Bezos, and Richard Branson have long trumpeted plans to make space travel a possibility for ordinary people, and those ideas are inching ever closer to reality. At the same time, other companies plan to mine the Moon for helium-3 and asteroids for precious metals. Popular-science writer Andrew May takes an entertaining, in-depth look at the triumphs and heroic failures of our quixotic quest to commercialize the final frontier.