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- Dictionarysupernova/ˈsuːpəˌnəʊvə/
noun
- 1. a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.
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noun
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A supernova is a powerful and luminous explosion of a star. A supernova occurs during the last evolutionary stages of a massive star, or when a white dwarf is triggered into runaway nuclear fusion. The original object, called the progenitor, either collapses to a neutron star or black hole, or is completely destroyed to form a diffuse nebula. The peak optical luminosity of a supernova can be compa... Wikipedia