Are you sitting still? You might think so, but you're not. Earth travels through space at 500,000 miles per hour. But it is not alone. Everything-stars, planets, even chunky balls of ice-is in motion. Why do we move? Where are we headed? Scientists have made fascinating discoveries and continue to search for more answers. Titles will captivate both teen and tween readers as they do a deep exploration of interesting topics from the worlds of sports, the arts, science, history, and more. Each book features 8 chapters, with accessible text written at a reading level of 2.5 and below. Fascinating sidebars and facts are presented in the text, along with graphics including charts, tables, and infographics. Each book includes a glossary with key words and definitions to support readers.