The Planets takes an in-depth look at the solar system, Earth's neighborhood in space. Readers will learn about the rocky worlds of the inner solar system and the gas giants of the outer solar system. They will also learn about dwarf planets and the distant worlds known as exoplanets. Features include a glossary, additional resources, and an index. Aligned to Common Core Standards and correlated to state standards. Early Encyclopedias is an imprint of Abdo Reference, a division of ABDO.