S4716's orbit around Sagittarius A* (VIDEO) University of Cologne This video is under embargo. Please login to access this video. Caption Stars in the S cluster orbit the black hole at the centre of our galaxy at great speed. S4716 is the fastest. Credit Florian Peissker, University of Cologne Usage Restrictions none 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.