Torus (IMAGE) DOE/Los Alamos National Laboratory Caption A Los Alamos National Laboratory simulation of an exploding white dwarf, in which the supernova drives an expanding shock wave that collides with a torus of material accreted from a companion star. Credit Los Alamos National Laboratory Usage Restrictions None 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.