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White dwarfs are no longer undergoing fusion, so while they are initially very hot ... white-hot, in fact ... they slowly cool and eventually become black dwarfs, completely burnt-out stars. We don't know of any black dwarfs, because by definition they don't emit light and because the universe isn't old enough for any stars to have cooled that far yet. It's estimated based on known physics that it would take about a million billion (1015)years for a white dwarf to cool to the temperature of the cosmic background radiation, and possibly longer than that if WIMPs or proton decay exist.

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14y ago

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