Learning about space has never been so easy with this compact book of all things space. What is the sun? Where does Earth fit into the solar system? Which planet is 1321 times the size of Earth? Learning about space has never been so easy with this compact book of all things space. Interesting facts will have even the most reluctant reader's attention with fun and factual pages! Learn why Saturn is the only planet surrounded by rings, and how many years it takes the farthest planet to orbit the sun!