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White dwarf stars are extremely hot, hence the bright white light they emit. This heat is a remnant of that generated from the star's collapse, and is not being replenished, but since white dwarfs have an extremely small surface area from which to radiate this heat energy they remain hot for a long period of time. Eventually a white dwarf will cool into a [black dwarf]?, but the universe has not existed long enough for any white dwarfs to have had enough time to cool down this far yet and so no black dwarfs are thought to exist. |
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