A study of the remains of a type Ia supernova whose light swept past Earth about 400 years ago finds no sign of a companion star. The result indicates that the supernova's progenitor was a pair of white dwarfs. See Letter p.164
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Ruiz-Lapuente, P. Progenitors of type Ia supernovae. Nature 481, 149–150 (2012). https://doi.org/10.1038/481149a
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DOI: https://doi.org/10.1038/481149a
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