00987cam a2200253 4500 606404026 TxAuBib 20151006120000.0 061205s2007||||||||||||||||||||||||eng|u 2006100684 9780618898329 lib. bdg. $17.00 0618898328 lib. bdg. $17.00 (OCoLC)76951118 DLC DLC DLC NjBwBT TxAuBib Follett Classic TxAuBib Scott, Elaine. When is a Planet Not a Planet : The story of Pluto. New York : Clarion Books, 2007. 43 p. : ill. (some col.) ; 26 cm. Includes bibliographical references and index. Explains how advancements in technology have changed our understanding of the universe and why the number of planets in the solar system went down from nine to eight. 20110915. Pluto (Planet.) TXNAV