This is a vast explosion, destroys an entire star. Seen in distant galexies, they are hard to study. When they occur in nearby galexies studies can take place more readily.
The last huge Supernovea seen in our galexy, was seen by Kepler in 1604. Sinse then the brightest Supernovea in the southern sky was was 1987A. In the northern sky, the brightest was 1993J. They fell into two different groups.
Type 1 results from the tranfer of mass inside a binary (or two star system) which consists of a white dwarf star and a giant star. In general type two supernovea are a single massive star which end in a spectacular light show.
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