In a white dwarf,what is the source of pressure that halts its contraction as it cools?

Name: In a white dwarf,what is the source of pressure that halts its contraction as it cools?
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In a white dwarf, the compression of electrons packed so closely together that they become incompressible generates pressure to counteract the force of gravity, which otherwise would cause the white dwarf to continue contracting as it cools. This phenomenon is known as electron degeneracy pressure.

In a White Dwarf,what Is the Source of Pressure That