Supernova are stellar explosions that take place when a star reaches its final stages of life. Research shows that they occur once every 3 centuries however the remnants of these explosions take a long time to reach us.
Supernova can also take place if a star develops and iron core that is larger than the Chandrasekar mass (the largest mass that a star can reach before imploding).
When these events do take place, they can be up to five billion times brighter than the sun!
All in all, supernova are very dangerous, but very interesting scientific phenomena.
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