Hubble Image (IMAGE) University of Oklahoma Caption OU astrophysicist and his Chinese collaborator used observations from NASA's Hubble Space Telescope to find two supermassive black holes in Markarian 231. Credit Space Telescope Science Institute, Baltimore, Maryland Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.