These cosmic ribbons of gas have been left behind by a titanic stellar explosion called a supernova. DEM L249 is thought to be the remnant of a Type 1a supernova, the death of a white dwarf star. White dwarf stars are usually stable, but in a binary system—two stars orbiting each other—a white dwarf can gravitationally pull so much matter from its companion that it reaches critical mass and explodes.
DEM L249, located in the Large Magellanic Cloud, is an unusual supernova remnant...
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