shepherd moon
Noun
Meaning
shepherd moon (plural shepherd moons)
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.
Noun
shepherd moon (plural shepherd moons)
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.