Hydrogen is used up in the fusion of hydrogen nuclei to produce helium and energy. The process is powered by hydrogen. As the hydrogen is depleted, the star's core condenses and heats up even more. This promotes the fusion of heavier and heavier elements, eventually resulting in the formation of all elements up to iron.
The Sun and other stars are powered by nuclear fusion reactions. A fusion reaction occurs when two light nuclei combine to form a single heavier nucleus. Because the total mass of the resulting single nucleus is less than the mass of the two original nuclei, the process releases energy. The remaining mass is converted into energy.
The occurrence of nuclear fusion in stars causes energy to be released from the core in the form of heat or light, or sometimes another nucleus. According to this, nuclear fission in stars virtually releases all elements.
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