词条 卫星
描述: 卫星是围绕行星、矮行星或小行星等较小天体运行的物体。这些卫星可以是人类发射的人造卫星，也可以是天然卫星（通常称为 moons）。地球有一颗天然卫星月球，还有许多人造卫星围绕它运行。
卫星星系这个术语有时也用来指围绕另一个星系运行的一个星系。
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