Binary System XTE J1550-564 (IMAGE) NASA/Goddard Space Flight Center Caption XTE J1550-564 is a binary system in which an evolved star orbits -- and donates matter to -- a black hole estimated at 10 times the sun's mass. Credit ESO/L. Calçada 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.