Why is the sky blue? How do astronauts breathe in space? What is a lunar eclipse? Eager readers want to know, and they will discover the answers to these questions and many more in this new book in the Do You Know?™  series. Engaging facts and answers to popular questions about the weather, the seasons, the solar system, and rocket launches will encourage children to learn more about the world beyond Earth. Explore the layers of the Sun, trace the timeline of space travel, and find out how astronauts prepare for their missions. Every Do You Know?™ book includes labeled illustrations, thought-provoking information, review sections, and an index of key terms.