If a star converted every bit of its mass into energy the, Physics

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If a star converted every bit of its mass into energy the

If a star converted every bit of its mass into energy the conversion efficiency would be 100%. But, the sun converts hydrogen into helium with an efficiency of only 0.7%. The sun has a, ass of 2X10^30kg. How long will the sun live if it changes all of its hydrogen to helium?

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