A shepherd moon is a natural satellite that helps to maintain the structure of a planetary ring system. This occurs by gravitationally interacting with the particles in the rings, keeping them confined and preventing them from spreading out. The gravitational pull of shepherd moons can create gaps in the rings or enhance the ring's edges by causing density waves. One of the most well-known examples of a shepherd moon is Prometheus, which orbits Saturn and plays a significant role in shaping the planet's F Ring.

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