White Dwarf

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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