" For relatively small stars, the Pauli exclusion principle keeps the electrons in a star sufficiently separated to prevent the star from contracting further after it has spent its fuel. In other words, the electrons counteract the crushing gravitational force. However, for stars more than about 1.5 times the mass of the sun (a mass known as the Chandrasekhar limit), this repulsive force would not be enough to stop stellar collapse. "
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