What must the remnant core mass exceed to form a black hole after a supernova?

Answer

Approximately three times the Sun's mass ($\approx 3 \text{M}_{\text{Sun}}$)

If the remnant core mass exceeds approximately three times the Sun's mass, gravity overwhelms even neutron degeneracy pressure, leading to the formation of a black hole.

What must the remnant core mass exceed to form a black hole after a supernova?

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