Whether you believe Pluto should still be classified as a planet or you’re dancing on its planetary grave, you owe yourself a book treat. Alan Boyle’s The Case for Pluto: How a Little Planet Made a Big Difference (258 pp., hardcover, John Wiley & Sons, New York, 2010, $22.95, ISBN 978–0–470–50544–1) is a sensational work that ought to be on your bookshelf.