What must a remnant core exceed to collapse into a black hole rather than remaining a neutron star?

Answer

Around three solar masses ($3 M_{\odot}$)

The maximum stable mass for a neutron star is estimated to be around three solar masses; if the remnant core exceeds this limit, neutron degeneracy pressure fails, leading to total collapse into a black hole.

What must a remnant core exceed to collapse into a black hole rather than remaining a neutron star?

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