Once carbon begins burning in the core of a high-mass star,the outer layers begin to fall inward,driving up the fusion rates and speeding up the star's evolution primarily because:

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As the outer layers of the star fall inward, they become denser and the temperature increases, causing the fusion rates to speed up. However, a significant amount of the energy produced by fusion is carried away from the core by escaping neutrinos, which have very low interaction rates with matter and can easily leave the star, effectively carrying away energy and further fueling the fusion process. This phenomenon, known as the neutrino loss catastrophe, is a major factor in the evolution of high-mass stars.

Once Carbon Begins Burning in the Core of a High-Mass