From Wikipedia, the free encyclopedia
衞星(Satellite),又寫做衛星,係圍住行星轉嘅天體,佢嘅運行軌道係封閉嘅圈,而唔係開口嘅雙曲線(Natural Satellite)同埋人造衞星(Man-made Satellite)兩種。單純喺技術角度嚟睇,圍住恆星轉嘅行星,甚至乎圍住銀河系中心轉嘅恒星都有可能會叫做「衞星」。不過啲人經常講嘅「衞星」係指圍住行星轉嘅天體,有時亦都可能指矮行星同埋小行星。
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