Budding astronomers will find this book fully illustrated and packed with information about artificial satellites and space probes. The illustrations are terrific! NASA and Science Library Photo Library photographs complement the clear well-organized text. Children will be intrigued to learn that satellites are used for navigation, sending radio waves, and to help predict the weather. Librarians and teachers will appreciate the table of contents, glossary and index. This book which is one of the "Eye on the Universe" series will be a strong addition to an astronomy or space exploration curriculum unit.