* Black dwarfs are theoretical objects. They are the hypothetical end-state of a white dwarf that has cooled down completely and no longer emits light.
* White dwarfs cool extremely slowly. The process of a white dwarf cooling to become a black dwarf is estimated to take trillions of years, much longer than the current age of the universe.
* No white dwarfs have had enough time to become black dwarfs. This means we haven't observed any yet.
So, while we can't point to a specific constellation for a black dwarf, it's a fascinating concept in astrophysics!
