OU astrophysicist and collaborators find supermassive black holes in quasar nearest Earth

Astronomers using NASA’s Hubble Space Telescope have found that Markarian 231 (Mrk 231), the nearest galaxy to Earth that hosts a quasar, is powered by two central black holes furiously whirling about each other.

 http://phys.org/news/2015-08-astrophysicists-supermassive-black-holes-quasar.html