Saturn has a total of 146 moons; 53 are named moons, and another 29 are still being studied. Many of the moons are very small: 33 are less than in diameter and 13 moons are less than . Seven moons are large enough to be a near perfect sphere caused by their own gravity. These moons are Titan, Rhea, Iapetus, Dione, Tethys, Enceladus and Mimas. Titan is the largest moon, larger than the planet Mercury, and it is the only moon in the Solar System to have a thick, dense atmosphere. Hyperion and Phoebe are the next largest moons, larger than in diameter.
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