What is the primary hydrogen fusion reaction used by stars similar to our Sun?
Answer
Proton-proton chain reaction
Stars whose core temperatures have not reached the threshold required to activate the highly efficient CNO cycle rely primarily on the proton-proton chain reaction for fusing hydrogen into helium. This process is characteristic of stars with masses similar to or less than our Sun. It is considered a relatively slow and steady method of energy generation, which contributes to the long, multi-billion year main-sequence lifespan observed for these moderate-mass stars, contrasting sharply with the explosive energy production seen in higher-mass stars.
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