单词	extragalactic
释义	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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