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And these white dwarfs, they can stay warm for hundreds of billions of years. And they're a very good place to search for life. Research, research has suggested that life would probably have a horrible time on a planet around a white dwarf. The habitable zone, the region where temperatures are just right to support liquid water on a planetary surface, around a black, around a white dwarf. The stand somewhere from a tenth to a hundred the distance from the Earth from the Sun, so it would be hard to maintain a liquid water supply without evaporating off the planet. Drop it.