Why is the sky blue? How do astronauts breathe in space? What is a lunar eclipse? The Do You Know?™ books provide an in-depth look at a wide range of popular subjects. Appealing to children who want to know everything, each thought-provoking book features: • 80 pages of informative content and answers to many popular questions • Hundreds of labeled, full-color illustrations • An index to key terms • And a "More to Know" section that motivates children to explore further Fans of Do You Know?™: Space and Sky will also enjoy other books in the series, including Dinosaurs and the Prehistoric World, Oceans and Marine Life, and Vehicles and Transportation. • Great family and classroom read-aloud book • Educational books for kids 5 to 8 • Nonfiction books for kids An indispensable resource for any child's library!