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A star that exploded in a galaxy just 21 million light-years from Earth is a red supergiant, an astrophysicist has said. The explosion was detected around 10 da.

Jane clarkCardiff astronomical societyUniversity of central lancashirePinwheel galaxyJoanne pledgerCentral lancashireAstrophysical journal lettersHubble space telescopeDr jane clarkDr joanne pledgerDpa exclusiveRed supergiant