SUNSET: 
Seeking Cas A, the Ghostly Remains of a Mysterious Supernova
We still don't know for sure if anyone saw the supernova explosion in Cassiopeia around 1680, but there's no question we can observe what remains of it today.
red supergiant
We still don't know for sure if anyone saw the supernova explosion in Cassiopeia around 1680, but there's no question we can observe what remains of it today.
By: Bob King November 28, 2018
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