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The decaying remnant of a star that has exhausted all available sources of nuclear fusion. White dwarfs
are typically just a few times greater in diameter than the Earth, and are composed of so-called 'degenerate' matter
(an unusual state in which atomic nuclei and electrons exist independently of one another). A white dwarf has no internal energy source, and will eventually
lose what energy it has, becoming completely a dead star known as a black dwarf.
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