What specific repulsive force ultimately halts the catastrophic core collapse?

Answer

Neutron degeneracy pressure

The core collapse is characterized by gravity driving material inward at speeds approaching the speed of light until the density becomes extraordinarily high—far surpassing that of an atomic nucleus. At this point of extreme compression, the atomic nuclei themselves are crushed together. This compression forces the protons and electrons to merge, forming neutrons. When the material reaches nuclear density, the repulsive force generated between these newly formed neutrons—termed neutron degeneracy pressure—finally becomes strong enough to overwhelm the immense inward gravitational force. This sudden resistance brings the violent implosion to an abrupt halt, which is the immediate precursor to the explosion.

What specific repulsive force ultimately halts the catastrophic core collapse?

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