Although supernovae occur on average only every 50-100 years in a given galaxy, that is only a
statistical statement. The adjacent image shows a rare event: two supernovae simultaneously within
a single galaxy, NGC 664 which is a spiral about 300 million light years away.
The supernovae are the yellow and blue blobs. Other bright spots are the nucleus
of the spiral galaxy hosting the twin supernovae and intervening stars
(Ref). The different colors of the two
supernovae reflect different temperatures, with blue being hotter.
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