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An enigmatic ring of icy particles circling Saturn, herded into a narrow ribbon by two tiny moons, was probably born of a cosmic collision, according to a study published Monday.Further toward Saturn, millions of ice blocks populating the planet's haunting halos are prevented from cohering into moons by its powerful tidal forces.In the boundary zone F ring's icy particles whirl around the planet in a band barely 100 kilometers across, itself orbited by moons Prometheus and Pandora.Saturn is the second largest planet in our Solar System after Jupiter, and has a radius about nine times greater than Earth.Some 60 moons circle Saturn, not including hundreds of "moonlets" such as the F ring's Prometheus and Pandora.
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