Readers will get an in-depth look at the critical components that make up space. Alongside engaging photos, readers will learn about planets, the moon, the sun, stars, asteroids, comets, meteoroids, galaxies, the universe, and the exciting field of space exploration. Features include a glossary, additional resources, and an index. Aligned to Common Core Standards and correlated to state standards. Abdo Reference is an imprint of Abdo Publishing, a division of ABDO.