Definition of extragalactic in English:

extragalactic

Syllabification: ex·tra·ga·lac·tic
Pronunciation: /ˌekstrəgəˈlaktik
 
/

adjective

Astronomy
  • Situated, occurring, or originating outside the Milky Way galaxy: extragalactic radio sources
    More example sentences
    • Hence the whole foundation of extragalactic astronomy and Big Bang theory is swept away’ .
    • It is definitely an extragalactic background.
    • The number of these sources is consistent with the expected number of extragalactic sources in the background sky.

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Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
noun
(in science fiction) navigation in outer space