ou took all the matter in Saturn’s rings and packed it into a sphere with an average density of 1.2 g/cm3, what would the radius of the sphere be? How does that compare to the radius of Mimas, for example? How about the case of Uranus: what would the radius of the sphere composed of all ring mass be? (Again use a density of 1.2 g/cm3) According to Wikipedia, the lower estimate for the mass of Saturn’s rings is 3 × 1019 kg and the mass of Uranus’s rings is ∼ 2 × 1016 kg.

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