This second edition follows the trail blazed by the bestselling first edition. It provides a framework for understanding the origin and evolution of the solar system, historical discoveries and details about planetary bodies and how they interact. Offering more than 50 percent new material, the work includes the latest explorations and observations, and hundreds of new color images and illustrations. It stands alone as the definitive work in this field, and will serve as a modern messenger of scientific discovery and provide a look into the future of our solar system.