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If you're just asking because you want to know, I'm not sure there is a "correct" answer. Stars are powered by different processes depending on where they are in their evolution, and often by more than one process at the same time (for example, it's possible for a star to get part of its power from the proton-proton chain reaction and part of it from the CNO cycle). Neither of those are, strictly speaking, "parts of atoms."

If you're asking because it's on a homework assignment, then ... the answer whoever wrote it was probably looking for is "nucleus."

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15y ago

What else can I help you with?