The most authoritative answer in 2024
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Owen Edwards——Works at Snapchat, Lives in Los Angeles, CA
Because the time required for a white dwarf to reach this state is calculated to be longer than the current age of the universe (
13.8 billion years), no black dwarfs are expected to exist in the universe yet, and the temperature of the coolest white dwarfs is one observational limit on the age of the universe.
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