galactic bulge 中文意思是什麼
galactic bulge
解釋
星系核球-
The galaxy ' s central region is called the galactic bulge because the stars form a ball a few thousand light years in diameter that extends above and below the disk of the galaxy
星系的中心區域叫做核球,原因是恆星組成了直徑幾千光年的球體,膨脹到星系盤上下兩側。
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