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Unformatted text preview: fusion occurs at about 1.2 billion K, Oxygen fusion occurs at about 1.5 billion K, and Silicon fusion occurs at about 2.7 billion K. Up to the production of iron in the most massive stars, the nuclear fusion process is able to create extra energy from the fusion of lighter nuclei. But the fusion of iron nuclei absorbs energy. The core of the massive stars implodes and the density gets so great that protons and electrons are combined to form neutrons + neutrinos and the outer layers are ejected in a huge supernova explosion. The more common low-mass stars will have a gentler death, forming a planetary nebula....
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- Fall '10