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The gravity of the moons helps to give the rings their distinctive shape. Some of the moons, due to volcanic activity and gravitational friction from Saturn, spew out tons of material into space that then adds ice and/or methane to the rings.

Beyond that, some moons around ringed planets actually "shepard" the debris rings to maintain the ring-like structure. The two Saturn moons Prometheus and Pandora are so called "shepard moons" that maintain Saturn's faint "F" ring.

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Orbital resonances

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12y ago

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