|  Artists' concept 
 |  | Hubble Finds That the Nearest Quasar Is Powered by a Double Black Hole Quasars are the light fantastic. These brilliant cores of active galaxies   blaze with the radiance of a hundred billion stars compressed into a   region of space not much larger than our solar system. Supermassive   black holes, with millions or billions of times the mass of our sun,   are the only imaginable powerhouse behind these tsunamis of raw energy.   This news release and its supporting materials are permanently achived at: http://hubblesite.org/newscenter/archive/releases/2015/31/ |  | 
    
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