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Massive stars end their lives in spectacular supernova explosions.Identifying the progenitor star is a test of stellar evolution and explosionmodels. Here we show that the progenitor star of the supernova SN 2008bk hasnow disappeared, which provides conclusive evidence that this was the death ofa red supergiant star.

The Disappearance of the Red Supergiant Progenitor of Supernova 2008bk