When is a planet not a planet? : the story of Pluto
NotesTable of contents: The wanderers -- Some early astronomers -- Ideas that work, and those that don't -- Pluto's problems -- Finding planets -- What is a planet?
Summary: On August 24, 2006, a group of astronomers made a big announcement: Pluto could no longer be considered a planet. This book explains how advancements in technology have changed our understanding of the universe - and exactly how and why the number of planets in our solar system went from nine to eight.
Librarian's MiscellaniaElaine Scott
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