One of the mysteries of the English language finally explained.
A small moon orbiting close to a planetary ring, especially of Saturn, and whose gravitational field confines the ring within a narrow band.
- ‘For one thing, the particles in some of the rings are corralled into narrow bands by the so-called shepherd moons: teeny satellites that orbit near the rings.’
- ‘Atlas and other moons exist outside the main ring system, as do the two F ring shepherd moons, Prometheus and Pandora.’
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