Double-Detonation Supernova (IMAGE) DOE/Oak Ridge National Laboratory Caption "Outflows" (red), regions where plumes of hot gas escape the intense nuclear burning at a star's surface, form at the onset of convection in the helium shell of some white dwarf stars. This visualization depicts early convection on the surface of white dwarf stars of different masses. Credit Adam Jacobs, Stony Brook University Usage Restrictions Image credit must be included. 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.