SCIENCE
Nardo, Don

Asteroids and Comets

(4) 4-6 Extreme Threats series. This cautionary book begins with the Tunguska event of 1908, when a meteor struck central Russia. It then considers evidence for such collisions in geologic and present times, discussing, for example, NEOs (near earth objects). Human attempts to predict, control, and deflect meteor strikes are touched on in a more cursory way. Numerous photographs illustrate the dry text. Timeline, websites. Bib., glos, ind.

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