Presents an investigation of comets, asteroids, and meteoroids and meteors, discussing what they are, what they are made from, where they orbit, and their impact on the Earth. Includes a glossary and resources for further study.

The beginning of the solar system -- Comets: dirty balls of ice -- Comets: a long journey -- Asteroids: minor planets -- Asteroids: where they orbit -- Meteoroids and meteors: rock from space to earth -- Meteorites: hitting earth's surface -- Studying the solar system -- Our solar system.