Summary
Nuclear fusion is the process of combining two light atomic nuclei to form a single heavier one, releasing a tiny amount of matter and converting it into massive amounts of energy.
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This process is what powers stars, including the sun, and generates light.
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The difference in mass between the reactants and products is manifested as either the release or absorption of energy.
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Nuclear fusion is the process that powers active or main-sequence stars and other high-magnitude stars, where large amounts of energy are released.
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