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Harvard-Smithsonian Center for Astrophysics (CfA) says a supernova discovered last year was caused by two colliding white dwarf stars. A
Harvard press release says "The white dwarfs were siblings orbiting each other. They slowly spiraled inward until they merged, touching off a titanic explosion." The image to the left is an artists depiction of the event that was previously only believed to exist in theory. Cool!