Final answer:
A white dwarf is a dense, hot, and old star that is the remnant core of a sun-like star at the end of its life.
Explanation:
A white dwarf is a very dense, hot, and old star. It is the remnant core of a star like the sun at the end of its life, incredibly dense and hot but no longer undergoing nuclear fusion. White dwarfs are about the size of Earth but can have a mass close to half that of the Sun.
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