The proton-proton chain and the CNO cycle both convert hydrogen into helium.

Name: The proton-proton chain and the CNO cycle both convert hydrogen into helium.
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Both the proton-proton chain and the CNO cycle are processes that stars use to convert hydrogen into helium, releasing energy in the process. The proton-proton chain is more common in smaller or medium-sized stars like the Sun, while the CNO cycle dominates in more massive stars.

The Proton-Proton Chain and the CNO Cycle Both Convert Hydrogen