Scott, Elaine

When is a planet not a planet? : the story of Pluto / Elaine Scott. - New York : Scholastic, c2007. - 44 p. : col. ill.

Includes bibliographical references, index, and glossary.

Introduction -- The wanderers -- Some early astronomers -- Ideas that work...and those that don't -- Pluto's problems -- Finding planets -- What is a planet?

ISBN: 9780545115995 (pbk.) ;

Subjects--Topical Terms:
Pluto (Dwarf planet)