The entries are well written and should be easily understood by the target audience of YA students. The breadth and depth of information will fascinate students and be very helpful in preparing reports and projects on a wide variety of space-related topics. School and public libraries should eagerly add this set to their collections. Grade 9 Up-Covering scientific, technological, and business aspects, this set offers a unique approach to its subject. Each alphabetically arranged volume has a different focus. The first, Space Business, covers current commercial activity in space, such as medical research, satellites, space law, business applications, and associated careers. Planetary Science and Astronomy has information on galaxies, stars, planets, and other celestial bodies. Space travel, vehicles, equipment, and explorers are covered in Humans in Space. The final volume, Our Future in Space, is highly speculative in its discussion of potential possibilities, technology, and conjectural ideas, such as faster-than-light travel, from science fiction writers, books, and movies. Biographical entries appear throughout the set. Articles include events and publications through 2001. Captioned color and black-and-white photos featuring people and equipment are informative, sometimes spectacular, although often small. Each table of contents covers the entire set and cross-references refer readers to articles in the other volumes. Glossary terms are highlighted in the text and defined in the margins as well. A useful and appealing approach to the subject.