ï ½ Why do some stars explode? ï ½ How do astronomers find black holes? ï ½ Where is the edge of the universe? Up-to-the-minute maps & diagrams explain the wonders of the universe. More than 100 illustrations of spacecraft, satellites, telescopes, & more Clear, easy-to-follow explanations of complex concepts Detailed star maps for all seasons Projects, activities & experiments Glossary of technical terms Fact File with the latest facts & figures