Black holes form when you have so much mass in
one place that the forces other than gravity can't
overpower the force of gravity itself. So, for
example, a neutron star is held up against its own
gravity by the strong nuclear force, that prevents
protons and neutrons from being packed together.
If the neutron star is too massive, then the
strong nuclear force will not be strong enough,
and it will become a black hole.
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