This is the category for  supermassive black holes, the largest class of black holes, upwards of a hundred thousand solar masses.  
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An artist's impression of the vicinity of the supermassive black hole in quasar SDSS J1106+1939.  Image: ESO/L. Calçada.
The following 6 pages are in this category, out of 6 total.
Category:Supermassive black holes