• Hubble Finds Nearest Quasar Powered by a Double Black Hole http://www.nasa.gov/feature/goddard/hubble-finds-that-the-nearest-quasar-is-powered-by-a-double-black-hole 16 comments 7/9/2015 space
• Hubble Finds That the Nearest Quasar Is Powered by a Double Black Hole http://hubblesite.org/newscenter/archive/releases/2015/31/full/ 10 comments 27/8/2015 space
• Hubble Finds That the Nearest Quasar Is Powered by a Double Black Hole http://hubblesite.org/newscenter/archive/releases/2015/31/full/ 5 comments 27/8/2015 science