How stars explode?

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Quality big stars before the explosion,like the sun on this will not explode.Big stars for the quality of the fusion reactions of H-He-...-Fe,the fusion of iron,fusion will not be able to continue,beacuse the average nuclear Rail is the lowest quality than iron atoms hravier atoms fission reactions release energy.Then because of the lack of law fusion reaction,the internal star suddenly cooled,the pressure on smaller(stable period is the same pressure and gravity),gravity makes the case in part to internal pressure on the eye of stars left(non-ferrous the part)more fierce high temperature and high pressure,the material will be left outside,which is a supernova explosion.When too much energy Rail would have happened fusion reaction(absorbed engrgy),resulting in a hravier than iron atoms,such as gold ,an silver.