extragalactic nebula

美 [ˌɛkstrəgəˈlæktɪk ˈnebjələ]

网络  天河外星云; 河外星云; 河外星系; 河外星云(星系)



英英释义

noun

  1. (astronomy) a collection of star systems
    1. `extragalactic nebula' is a former name for `galaxy'

    Synonym:    galaxy