"Fermions also help maintain the structure of the universe's large objects... there is a class of stellar objects whose shape depends solely on the competition of fermions: white dwarfs and neutron stars - tiny, cold corpses whose brilliance has faded and whose swirling gasses have given up their struggle again gravitation. The only thing that keeps white dwarfs and neutron stars from collapsing is the exclusion principle. In the case of white dwarfs, gravitation has torn electrons from their atoms and compressed them to such a degree that further compression would cause the electrons to violate their pact to avoid one another. Neutron stars are similarly compressed, except that for them gravitation is counterbalanced by the mutual avoidance of neutrons, which are also fermions."

Hans Christian von Baeyer, The Fermi Solution

Coherence Fermi exclusion principle Stimulated emission