This intimate and beautiful study of Earth investigates the relationship between our planet, the sun, and the moon. Why are there seasons on Earth? How does day pass into night? What protects the Earth from the sun's intense heat? Why is the surface of the Earth constantly changing? The informative text reveals how Earth's unique position in relation to the sun makes it the only planet where life is possible. The stunning full-color photographs will mesmerize young readers about the mysteries of space.