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4) The proton-proton chain and the triple alpha process are both exothermic. It turns out that...

4) The proton-proton chain and the triple alpha process are both exothermic. It turns out that all fusion processes that result in an element between hydrogen (1 proton) and iron (26 protons) are exothermic. Why is this important? What would make it difficult for an endothermic fusion process to be sustained?

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