Offers readers a captivating look into UFOs and questions whether aliens exist, complete with vivid photographs and exciting diagrams. Back matter includes an in-depth 'Out of This World' feature that highlights a related topic, a phonetic glossary, resources for further study, and an index. Outer space is full of wonder and mystery. Is there life beyond Earth? What is a comet made of? Young readers will enjoy blasting into space with this exciting,...

Describes the origins, characteristics, and future of the sun, planets, moons, asteroids, meteoroids, and comets.