If a main-sequence star's core temperature increased, fusion reaction rates would decrease because the protons would be moving faster.

Name: If a main-sequence star's core temperature increased, fusion reaction rates would decrease because the protons would be moving faster.
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Fusion reaction rates increase with higher core temperatures because the protons are moving faster and collide more frequently, leading to more successful fusion reactions.

If a Main-Sequence Star's Core Temperature Increased, Fusion Reaction Rates