If a massive star's remnant core mass after a supernova exceeds roughly $3 ext{M}_ ext{odot}$, what object forms?

Answer

A black hole

If the remnant core mass following the supernova explosion exceeds roughly $3 ext{M}_ ext{odot}$, gravity overwhelms all known forces, leading to the formation of a black hole.

If a massive star's remnant core mass after a supernova exceeds roughly $3 	ext{M}_	ext{odot}$, what object forms?
sizeastronomystarmasssupergiant