extragalactic
/ˌɛkstrəɡəˈlaktɪk
/adjective Astronomy
Situated, occurring, or originating outside the Milky Way galaxy: extragalactic radio sources...
- 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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