Nuclear fusion: The primary source of the energy radiated by a star, such as the sun, is

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The primary source of the energy radiated by a star, such as the sun, is fusion reactions in which hydrogen is fused to form helium. Nuclear fusion is the process of combining atomic nuclei to form a heavier nucleus, releasing energy in the process. In the sun, hydrogen atoms are fused under high temperatures and pressures to form helium atoms, releasing a tremendous amount of energy in the form of light and heat.

Nuclear Fusion: the Primary Source of the Energy Radiated by a Star