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G299, the remnant of what astronomers think was a Type Ia supernova 4,500 years ago. (NASA/CXC/U.Texas/S.Post et al./MASS/UMass/IPAC-Caltech/NSF)
G299, the remnant of what astronomers think was a Type Ia supernova 4,500 years ago. (NASA/CXC/U.Texas/S.Post et al./MASS/UMass/IPAC-Caltech/NSF)