Fig 3: Cowie3 - Moving shocks Cir X-1 (VIDEO) Royal Astronomical Society This video is under embargo. Please login to access this video. Caption GIF of moving termination shocks from Circinus-1. These are regions where the jet violently rams into the surrounding material causing a shockwave travelling at a significant fraction of the speed of light. Credit Fraser Cowie 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.