Super Explorers take you deep into space to see the planets in our Solar System and beyond: Our Solar System has 8 planets, 5 dwarf planets and many minor planets. Most planets have at least one moon like Earth, but Jupiter has 69 moons and Saturn has 62! The Sun's gravity keeps the planets in our Solar System circling around it. Mercury is the closest planet to the sun; the temperature there is 117C (243F). Neptune is the farthest planet from the sun; the temperature there is -216C (-357F). Scientists think there may be extraterrestrial life on Enceladus, a moon of Saturn, because there may be liquid water under the surface!