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A white dwarf has approximately the mass of our Sun, in a volume that's about a million times smaller - so it has a very high density (some tonnes per cubic centimeter). It's also very hot. Since energy production has stopped, they will cool down over time, but not enough time has elapsed for that to happen yet - in other words, the existing white dwarves are still very hot.

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Are white dwarf stars young?

No. A white dwarf is a remnant of a dead star.


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