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Our solar system used to have nine planets. But recently, scientists ruled that Pluto was actually a "dwarf planet." So what exactly is a dwarf planet, how many of them are there, and how do scientists study and classify them? All the facts you need, and lots more, are included in this up-to-date book, featuring a center spread with fast facts.
48 pages, full-color illustrations, Enslow Publishers, Inc.
ISBN-13: 978-0-7660-3187-6
http://www.enslow.com/displayitem.asp?type=1&item=3056
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