Tell me what are supernovae?

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Super novae are stars whose brightness can suddenly increase to 20 magnitudes or more. They are like novae, whose brightness however increase suddenly between the range of 10 and 20 magnitudes only. This is one stage of life of a star. supernova explosions happen when stars run out of thier fuel i,e hydrogen. they then end up as black hole, white dwarf or nebulae depending upon thier mass.