Earth has one moon. Mars has 2 moons. Jupiter has 67 moons, the most out of the planets in our solar system. Saturn has 62 moons, the second planet to have the most moons.Uranus has 27 moons.ars has 2 moons. Jupiter has 67 moons, the most out of the planets in our solar system. Saturn has 62 moons, the second planet to have the most moons. Uranus has 27 moons.