Supernova 'CSI' Team Eyes Old Photos for Stellar Bla

Supernova 'CSI' Team Eyes Old Photos for Stellar Blast Victim
SPACE.com
This artist's conception shows what scientists believe to be the progenitor system of the supernova SN 2011dh, which exploded in the Whirlpool galaxy in May 2011. The system consists of a blue star and a yellow supergiant.
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