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to 5 GK (430 keV), which opposes and delays the contraction. However, since no additional heat energy can be generated via new fusion reactions, the final unopposed contraction rapidly accelerates into a collapse lasting only a few seconds. The central portion of the star is now crushed into a neutron core with the temperature soaring further to 100 GK (8.6 MeV) that quickly cools down into a neutron star if the mass of the star is below . Between and , fallback of the material will make the neutron

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