Nearby quasar may be home to dynamic duo

Twin black holes could provide insight into galaxy formation

pair of supermassive black holes

BOSOM BUDDIES  A pair of supermassive black holes might live in the heart of the galaxy Markarian 231, shown in this Hubble Space Telescope image. 

A. Evans (Univ. of Virginia, Charlottesville; NRAO; Stony Brook Univ.), the Hubble Heritage Team/STScI/AURA, Hubble Collaboration/ESA and NASA 

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