A star is a type of fusion reactor. Light nuclei of gases such as hydrogen merge to form helium under enormous pressure caused by gravity, and because this procedure releases energy, the start starts to radiate the excess energy. Helium fusion later generates heavier elements, and so forth.
What is nuclear fusion?
Nuclear fusion is a response that occurs when two or more atomic nuclei merge to produce one or more distinct atomic nuclei and subatomic particles.
The distinction in mass between reactants and products manifests as either energy release or absorption.
Thus, the process is nuclear fusion.
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