'Significant and unexpected': Dying star spits out a sun's w

A supernova, pinpointed by amateur astronomers, could reveal unexpected new steps in the deaths of massive stars.

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Mount Hopkins , Arizona , United States , Mauna Kea , Hawaii , Japan , United Kingdom , Japanese , Daichi Hiramatsu , Tom Bole , Fred Lawrence Whipple , Smithsonian Center , Pinwheel Galaxy , Ursa Major , Multi Mirror Telescope , Fred Lawrence Whipple Observatory , Edo Berger , Submillimeter Array , Astrophysical Journal ,