SCIENCE
Scott, Elaine

When Is a Planet Not a Planet?: The Story of Pluto

(2) 4-6 The first two chapters offer information about planetary discovery. Scott then turns her attention to how scientists think, making clear the differences between hypotheses, theories, and laws. The fourth chapter outlines Pluto's planetary peculiarities. Throughout, the author reiterates that future discussions will change, because scientific knowledge is not static. Illustrations include photographs, artists' renderings, and diagrams of various planetary features. Reading list, websites. Glos., ind.

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