The Sun is at the center of the Solar System and is the source of light and heat for all the planets. Venus has toxic clouds that trap heat, bringing surface temperatures up to 400 degrees Fahrenheit. Earth is the only known planet that sustains life and has one moon. Mars has a reddish appearance and two small moons. Jupiter is the largest planet and has swirling storms visible from space. Saturn has rings and is the second largest planet in the Milky Way.