During the first reaction of the proton-proton chain of nuclear fusion, a weak force causes one of the protons to transform into a neutron and emit positron and neutrino electrons.
When two or more atomic nuclei fuse, they can create new atomic and subatomic particles in a reaction known as nuclear fusion (neutrons or protons). Energy is either released or absorbed depending on the mass differential between the reactants and products. Since the nuclear binding energies of the atomic nuclei before and after the reaction were different, this difference in mass results. Large amounts of energy are released during nuclear fusion, which is the mechanism that drives active stars, also known as main sequence stars, and other high-magnitude stars.
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