UMBH Gravitational Lensing Video (VIDEO) Durham University This video is under embargo. Please login to access this video. Caption A video showing how Astronomers used gravitational lensing to discover a black hole 30 billion times the mass of the sun in a galaxy 2 billion light years away. Credit Durham University Usage Restrictions Should be used in conjunction with this media release only. License Original 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.