Black Hole Heartbeat Signal Image (IMAGE) Durham University Caption A black hole including the heartbeat signal observed in 2007 and 2018. Credit Dr Chichuan Jin, of the National Astronomical Observatories, Chinese Academy of Sciences and NASA/Goddard Space Flight Center Conceptual Image Lab. 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.