The plural of supernova is supernovae!
Fantastic!
Triggered by powerful events, such as the collapse of a large star's core, or a "nu8clear demise" of a white dwarf, these are rare occurrences. (About once a century in average spiral galaxies.) HOWEVER! The NGC 2770 has two currently visible supernovae, as well as one that was originally spotted in 1999. While this in itself is noteworthy; an X-Ray burst, or low end GRB has been detected.
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