extragalactic nebula中文什么意思
河外星云
- extragalactic: adj. 银河系外的，(银)河外的。 ...
- nebula: n. (pl. -lae nebul ...
- elliptical extragalactic nebula: 椭圆河外星云
英文释义
名词- (astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust; "`extragalactic nebula'' is a former name for `galaxy''"
同义词：galaxy
