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Loading contentThe extremely luminous core of a distant galaxy powered by a feeding supermassive black hole.
Quasars are the brightest members of the active-galactic-nucleus family: a supermassive black hole accreting matter through a hot disk outshines its entire host galaxy, visible across billions of light-years. Their huge redshifts revealed the scale of the distant Universe.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.
Southern-hemisphere observatory data and imagery (VLT, ALMA partner).