Includes bibliographical references and index.

Smashing into Earth -- Defending planet Earth -- Asteroids -- Meteoroids, meteors, and meteorites -- Comets -- From far away -- What is still a mystery?.

"What are asteroids, comets, and meteors made of? What can scientists do if an asteroid is headed toward Earth? Learn how astronomers prepare for space objects hitting Earth, from tracking them to building asteroid-hunting telescopes. Budding astronomers will learn all about meteors, asteroids, and comets, including the history of asteroids hitting Earth and the differences between space rocks"-- Provided by publisher.

Ages 8-11 Capstone Press.

Grades 4-6 Capstone Press.