Learn what the sun is made of, and how the sun's gravity makes the planets orbit around it. Find out how far each planet is from the sun, how many moons each planet has, and what the planets look like up-close!
Why study the solar system? Space exploration could explain the history of the universe. It may also reveal whether there is other life out there!
Features full-color, up-close photographs of the planets in the Earth's solar system.
A simple explanation of the sun, moon, and the nine planets, with additional facts about asteroids and space exploration.