Six of the planets, and the six largest dwarf planets, are orbited by moons. There are more than 200 moons in the Solar System. Mercury and Venus have no moons, and Jupiter and Saturn have the largest number of moons. The largest moon is Ganymede which is a moon of Jupiter. Titan is one of Saturn’s moons. It is the only moon in the Solar System to have an atmosphere, which is mainly composed of nitrogen.
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