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Markarian 231, a binary black hole found in the center of the nearest quasar host galaxy to Earth, is seen in a NASA illustration released August 27, 2015. Like a pair of whirling skaters, the black-hole duo generates tremendous amounts of energy that makes the core of the host galaxy outshine the glow of the galaxy's population of billions of stars, according to a NASA news release. Hubble observations of the ultraviolet light emitted from the nucleus of the galaxy were used to deduce the geometry of the disk, and astronomers were surprised to see light diminishing close to the central black hole, said NASA. (Photo by Reuters/NASA)
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