Nearby quasar may be home to dynamic duo
Twin black holes could provide insight into galaxy formation
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