Pan: A Moon That Orbits Inside Saturn's Rings

Pan is a moon that orbits inside Saturn's rings. It is large enough to gravitational carve out a gap all the way round the ring. The width of the gap is determined by the mass of the moon. The larger the moon the larger the size of the gap it can clear in the ring.

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The moon pan is like a needle on a record player, Saturn reminds me of a record player always has ...