Strange gamma-ray heartbeat puzzles scientists (IMAGE) Deutsches Elektronen-Synchrotron DESY Caption The microquasar SS 433 (background) sways with a period of 162 days. The inconspicuous gas cloud Fermi J1913+0515 (foreground), about 100 light years away, pulsates with the same rhythm in gamma rays, suggesting a direct connection. But how exactly the microquasar drives this 'heartbeat' of the gas cloud is still puzzling. Credit Credit: DESY, Science Communication Lab Usage Restrictions Free use by the media if reporting on the related paper. 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.