The prolonged death of light from type Ia supernovae

Three years after its explosion, a type Ia supernova continues to shine brighter than expected, new research finds. The observations suggest that the powerful explosions produce an abundance of a heavy form of cobalt that gives the heat from nuclear decay an extra energy boost. The work could help pinpoint the parents of type Ia supernovae -- a stellar explosion frequently used to measure distances to faraway galaxies -- and reveal the mechanics behind these explosions.

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