extragalactic
Adjective
Meaning
outside or beyond a galaxy
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Examples
extragalactic nebula
Aberration due to this motion is known as secular aberration and affects the apparent positions of distant stars and extragalactic objects.
Schilling 2002, p. 118–123 Within a few months, the controversy about the distance scale ended: GRBs were extragalactic events originating within faint galaxies at enormous distances.
Clusters are quite prominent in X-ray surveys and along with AGN are the brightest X-ray emitting extragalactic objects.
These postulations opened new horizons for astronomy: for the first time extending astronomy beyond the solar system to galactic and extragalactic realms.
Thus the observed radiation density (the sky brightness of extragalactic background light ) can be independent of finiteness of the Universe.