Zombie Stars Shine On after Mystery Detonations

It should have been physically impossible. Millions of years ago, a white dwarf—the fading cinder of a sunlike star—was locked in a dizzying dance with a bright companion star. The two had circled each other for eons, connected by a bridge of gas that flowed from the companion onto the white dwarf allowing it to grow heavier and heavier until it could no longer support the extra weight. At this point, the white dwarf should have exploded—blowing itself to smithereens and producing a supernova that briefly shone brighter than all the stars in the Milky Way combined. Then once the supernova faded and the white dwarf’s innards were dispersed across the galaxy, there would quite literally be nothing left save for its companion star. But against all odds, the explosion did not fully rupture the white dwarf. Instead, it survived.