Why is the Sun the center of the Solar System, and how old is it? Why can't we count stars? Why do Earth and other planets revolve around the Sun? This encyclopedia will answer these and more whys for you. Learning is made simpler with well-labeled diagrams and an extensive glossary of difficult words. Bonus The book comes loaded with Isn't It Amazing-a section of fun facts to keep you glued for more. Explore, Discover and Learn, all about the Space! Well-researched content, developed by subject experts Crammed with illustrations, photographs and detailed 3D CGI images Packed with facts, and an exhaustive glossary Excellent for gifting and school libraries Sturdy hardback format