HLX-1 (IMAGE) Lomonosov Moscow State University Caption A unique object called HLX-1 (Hyper-Luminous X-ray source 1) is now the only reliable candidate as the intermediate-mass black hole. Credit NASA, ESA, S.Farrell (Sydney Institute for Astronomy, University of Sydney)) 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.