The solar system is our Sun and everything that travels around it. The Sun is the center of the solar system and it is surrounded by nine planets along with their moons. The planets are arranged by their closeness to the sun. The solar system also includes comets, asteroids, and other space objects that orbit the Sun. The Sun is the biggest object in our solar system.
Astronomers think the solar system is more than four billion years old.
Click here to see if you can win a game of planet tac toe. Cli ck here to see if you can put the planets in order. Click here to find out facts on each planet .