Stellar Collision Triggers Supernova Explosion (IMAGE) National Radio Astronomy Observatory Caption Fast-moving debris from a supernova explosion triggered by a stellar collision crashes into material thrown out earlier, and the shocks cause bright radio emission seen by the VLA. Credit Bill Saxton, NRAO/AUI/NSF Usage Restrictions Credit must be given to the creator. License CC BY 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.