大氣層(Tāi-khì-tsân)指崁佇天文物體外面的一重氣體,遮的氣體受物體的地心引力吸引,物體的質量若有夠額,引力就有夠力繼續共氣體掠牢的,通維持一个固定的大氣層,有寡惑星的大氣層特別厚;(人因)的成份主要是氣體,所以號做氣體大惑星 (gas giant)。


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