Supernova Shock Front (IMAGE) International Centre for Radio Astronomy Research Caption The supernova shock front as it pushes material from the blue and red supergiant phases. Credit Credit: CAASTRO/Mats Björklund (Magipics) Usage Restrictions Attribution, no derivatives. 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.