What is a planet? What are planets made of? This volume addresses these questions and more in a fascinating look at the planets that make up our solar system. Readers will explore boiling-hot Mercury and freezing-cold Neptune, and everything in between, learning what makes each planet special. The text and fact boxes are supplemented by amazing photographs taken by spacecraft, which give readers a close-up look at space bodies that are so far away. Readers are sure to enjoy this amazing space adventure.