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参考Galactic disk 的定义与解释 :
The galactic disc is the plane in which the spirals,bars and discs of disc galaxies exist.Galaxy discs tend to have more gas and dust,and younger stars than galactic bulges,or galactic haloes.
The galactic disc is mainly composed of gas,dust and stars.The gas and dust component of the galactic disk is called the gaseous disk.The star component of the galactic disk is called the stellar disk.
P.S.,天文学并没有奥卡星云,Oka is one of the authors of that particular scientific paper.
1年前
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