The primary source of the energy emitted from the sun is a fusion process.
The sun undergoes nuclear fusion, which generates solar energy. The protons of colliding hydrogen atoms combine to generate helium atoms during fusion in the sun's core.
Nearly all elements are produced via nucleosynthesis, a process that powers stars. The fusion of hydrogen atoms into helium is how the Sun, a main-sequence star, generates its energy.
When two or more atomic nuclei combine to form new atomic and subatomic particles, it is known as nuclear fusion (neutrons or protons). Depending on the mass difference between the reactants and products, energy is either released or absorbed.
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