What determines whether a massive star remnant becomes a Neutron Star or a Black Hole?

Answer

The mass remaining in the core after the supernova explosion.

The final fate hinges on the remnant core mass; if it exceeds the Tolman-Oppenheimer-Volkoff (TOV) limit, collapse continues into a black hole; otherwise, a neutron star forms.

What determines whether a massive star remnant becomes a Neutron Star or a Black Hole?
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