When Is a Planet Not a Planet? The Story of Pluto
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When Is a Planet Not a Planet?
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When Is a Planet Not a Planet? The Story of Pluto
When Is a Planet Not a Planet?
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The fascinating and historic 2006 "downgrading" of Pluto from "planet" to "dwarf", told in accessible terms. "A succinct, timely, and somewhat surprising account of planetary history."—Booklist
IRA Teachers' Choice