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The sun's heat and light originate primarily in the conversion of mass to energy through nuclear fusion processes; the larger fraction through the proton-proton chain where hydrogen fuses into helium, and a smaller fraction through the CNO cycle which also catalytically consumes hydrogen and produces helium.

Estimates say about 600 million tons of hydrogen get converted to helium every second.. at that rate, the sun will run out of hydrogen fuel in about 5 billion years.

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Q: What is the primary source of the sun's energy?
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