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The amount of mass lost through nuclear fusion is only 7/10 of 1% of the mass of the four hydrogen nuclei. However, it takes a multitude of reactions for the Sun to produce the amount of energy that it does. Each second, the Sun’s lost mass is about 5 million metric tons. When compared to the Sun’s total mass, the amount lost through nuclear fusion is almost insignificant. Therefore, we don't see the Sun decreasing in size.

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16y ago

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