Cover Images: Bkgd, Corbis Royalty-Free; BM, NASA/Johnson Space Center; M, Getty Images; BL, Barry Rosenthal/Getty Images; BFL, Bettmann/CORBIS; TR, Bettmann/CORBIS; BR, George K. Warren/Corbis; TL, Illustration by Michael J. Deas; B, Getty Images; Title page Corbis Royalty-Free; Spine: Corbis Royalty-Free; Back cover: Corbis Royalty-Free
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ISBN-13: 978-0-13-368213-7
ISBN-10: 0-13-368213-7
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