A quantum state where neutrons are packed at nuclear density, creating an extremely powerful pressure that supports neutron stars against gravitational collapse. This occurs when matter is compressed beyond the point where electron degeneracy can provide support.
From 'neutron' (discovered by Chadwick in 1932) and Latin 'degeneratus.' The concept emerged in the 1930s when physicists realized that extremely dense matter would consist primarily of neutrons held up by quantum pressure.
Neutron degeneracy creates the densest stable matter in the universe - neutron stars are essentially giant atomic nuclei the size of cities! The pressure is so extreme that protons and electrons are crushed together to form neutrons, creating matter denser than the nucleus of an atom.
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