Last Updated
：2025/11/20
shepherd moon
（ plural ）
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A small moon that orbits near the outer edges of a planetary ring or within gaps in the ring. The edge of the ring remains sharply defined owing to the gravity of shepherd moons.
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shepherd moon
The shepherd moon carved a narrow gap in the ring as its gravity kept the ring's edge sharply defined.
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The shepherd moon carved a narrow gap in the ring as its gravity kept the ring's edge sharply defined.
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