Question

what is a supernova ​

Answer 1

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A supernova is a powerful and luminous stellar explosion. This transient astronomical event occurs during the last evolutionary stages of a massive star or when a white dwarf is triggered into runaway nuclear fusion.

Answer 2

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A supernova is a large explosion that takes place at the end of a star's life cycle. In other words, we can say a supernova is the explosion of a star. 

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