What direct result of greater mass leads to the higher core temperatures required for extreme fusion?
Answer
Far stronger inward crush leading to much higher core pressure
A star's formation from more raw material means it possesses greater mass. This increased mass results in a significantly stronger gravitational pull attempting to collapse the star inward. This intensified inward crush translates directly into substantially higher core pressure. According to the physics of stellar interiors, increased core pressure is intrinsically linked to elevated core temperatures. It is these higher temperatures, enabled by the initial mass, that allow the star to unlock more powerful, temperature-sensitive fusion pathways, such as the CNO cycle, for energy generation.

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