Black holes form when there is insufficient force to counter accretion and subsequent compression by gravity. There are a few forces that act as a counter: - t

Black holes form when there is insufficient force to counter accretion and subsequent compression by gravity. There are a few forces that act as a counter: - thermally generated pressure as a result of exothermic reactions (like nuclear fusion), - Coulomb pressure (atomic nuclei opposing each other), or - quantum-mechanical degeneracy pressure (keeps white and brown dwarfs and neutron stars from collapsing)