Black dwarfs by their name are the opposite of hot. A black dwarf becomes a black dwarf when all residual heat has escaped into space.
They will be as cold as space itself.
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No, black dwarfs are not hot. They are actually the cooled remnants of white dwarfs that have radiated away all of their heat and are no longer undergoing nuclear fusion.
None of the above. White dwarfs and the black dwarfs they will become consist of a unique state of matter called electron degenerate matter.
There are more white dwarfs than black holes in the universe. White dwarfs are the end stage of low to medium mass stars, while black holes are formed from the remnants of massive stars. Since low to medium mass stars are more common than massive stars, there are more white dwarfs in the universe.
Black dwarfs have not formed in the galaxy because the universe is not old enough for any white dwarfs to have cooled sufficiently to become black dwarfs. The process takes trillions of years, and the universe is estimated to be only about 13.8 billion years old.
There are currently no black dwarfs. The time it would take for a white dwarf to cool to a black dwarf is greater than the current age of the universe.
It is estimated that it would take trillions of years for a white dwarf to cool to a black dwarf, which is more than the current age of universe. So black dwarfs do not exist yet.