How do stars significantly more massive than the Sun ($ ext{e.g., } > 2 M_{ ext{Sun}}$) regulate helium ignition?
Answer
Immediate expansion and cooling based on high thermal pressure.
Massive stars have cores where thermal pressure is dominant. When the $10^8 ext{ K}$ threshold is met, the resulting energy release causes immediate, slight expansion and cooling, allowing for a smooth transition into stable core helium burning.
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