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Describes existing space technology that could be used to mine the galaxy for Earth's energy, mineral resource, and food needs. Lewis (codirector, NASA, U. of Arizona Space Engineering Research Center) makes a convincing case for balancing research and economic necessity by proposing strategies to extract oxygen from lunar rocks, harness the natural hydrogen and helium of the gas giant planets to power fusion reactors, and create space vehicles from hollowed out asteroids. His argument rests on the proposition that space exploration is not just an expensive hobby but also a source of tremendous business opportunity. Annotation c. by Book News, Inc., Portland, Or.