Find out how Earth formed and what makes it different from all the other planets. Discover why we have summer and winter and day and night, and learn how spacecraft from Earth explore the solar system. Part of the Our Solar System series of books that explore the exciting topic of space and are specially written for younger readers. With stunning photographs and explanatory artwork, the books are the perfect introduction to our solar system. Other titles in the Asteroids, Comets and Meteors; The Moon; The Inner Planets; The Outer Planets and The Sun