Award-winning science writer Seymour Simon explores the Red Planet through fascinating facts and amazing full-color photographs. Readers will learn about the recent discovery of water, the Valles Marineris-the biggest valley on Mars-the ice caps, recent expeditions, and more. This updated edition includes: * author's note* stunning full-color photographs* glossary* index* websites and additional reading sources Supports the Common Core Learning Standards, Next Generation Science Standards and the Science, Technology, Engineering, and Math (STEM) standards.