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Electron degeneracy pressure is a quantum mechanical phenomenon that arises from the Pauli exclusion principle, which states that no two fermions (particles with half-integer spin, such as electrons) can occupy the same quantum state simultaneously. This principle plays a crucial role in the behavior of electrons in dense materials. In astrophysics, electron degeneracy pressure is especially significant in the context of white dwarfs, which are the remnants of stars that have exhausted their nuclear fuel and collapsed under gravity.