As I said before a Nova is a completely different process compared with a Supernova. A Nova is actually a sudden brightness that spreads across the surface of a White dwarf--kind of a star. The brightness is the result of a fusion reaction that happens on the surface of the White dwarf, and that fusion reaction is initiated by the matter that was gravitated towards and got accumulated across the surface of the White dwarf from a nearby binary neighbor.
This doesn't cause any sort of huge impact on the White dwarf's dimensions or properties, and hence can happen again and again as long as its neighbor stays close enough, and the matter gets accumulated on its surface.
Supernova on the other hand is a complete destruction of a star that which can't able to withstand its own gravity, when it happens to reach a certain mass at the end of its fuel consumption. The limit being found as 1.4 solar masses by Chandrashekar and was popular as Chandrashekar Limit.
Obviously it happens just once for a star that supposedly reaches above or equals Chandrashekar Limit, after burning away its complete fuel, unlike Nova.
Supernova got classified in to two types depending up on the way it reaches the Chandrashekar Limit.
-- I will try to give a much detailed explanation in my next post. :)
Earlier it was thought that the Supernova is a kind of bigger and brighter Nova and hence the name. And now, the name stayed but not the definition. A Supernova is in noway related to Nova where the former is caused by the gravitational collapse and the later by the fusion reaction.
The only thing that appears common for the both at times is White dwarf.
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