Download or read book Gravity written by Lisa Hill and published by Heinemann-Raintree Library. This book was released on 2009 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: How does gravity hold the universe together? How do satellites orbit the Earth? What would happen if gravity was turned off? The visually stimulating 'Sci-Hi' books take learning science core curriculum to a whole new exciting level. Each title explores an area of life, physical, or earth science in a way that is both engaging and comprehensive.