Particles within the rings can be moved inwards or outwards, as these tiny objects called shepherd moons, whose gravitational force can shape and sculpt the rings themselves.
星环内的粒子可以向内或向外移动，这些微小的物体被称为牧羊卫星，它们的引力可以形成和塑造星环本身。
Shepherd moon
原声例句
地球实验室
英语百科
Ring system (astronomy)
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A ring system is a disc or ring orbiting an astronomical object that is composed of solid material such as dust and moonlets, and is a common component of satellite systems around giant planets. A ring system around a planet is also known as a planetary ring system.
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