Supernovas aren't common, but they do happen. Advances in astronomical observation have made it possible to see them in other galaxies, which has enhance our knowledge of how they happen and what happens when they happen.
There's a new observable one. Read about it here.
Supernova in Messier 82
Adam Block took this picture. The supernova is the orangish object slightly down and to the right of the galactic center.
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