What physical process leads to the core-collapse supernova in high-mass stars?

Answer

The outward pressure from fusion can no longer counteract gravity after the core fuel is exhausted.

In high-mass stars, when the nuclear fuel in the core is completely exhausted, the resulting loss of outward fusion pressure allows gravity to dominate, leading to an unstoppable inward collapse of the core.

What physical process leads to the core-collapse supernova in high-mass stars?
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