No. This is the hypothetical final stage of a white dwarf, after it cools down so much that it doesn't have a significant amount of energy left. This cooling down takes a long, long time, and white dwarves have not yet have the time to cool down that much (that is to say, the Universe is too young yet to have black dwarves).
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. See related question. If this is not an astronomy question but one of "another sexual" nature then I suggest re posting with more precise details in the question.
None of the above. White dwarfs and the black dwarfs they will become consist of a unique state of matter called electron degenerate matter.
I think white dwarfs. This is because they are much more low mass than black holes. White dwarfs are much more common in the universe than black holes, because we have only discovered a few black holes whereas we are aware of many white dwarfs.
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.
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. See related question. If this is not an astronomy question but one of "another sexual" nature then I suggest re posting with more precise details in the question.
black dwarfs, cuz space is black too, so they would blend in with the night sky. red dwarfs would also be difficult to see, since they are very faint.
None of the above. White dwarfs and the black dwarfs they will become consist of a unique state of matter called electron degenerate matter.
their colour is one thing but a black dwarf originates from a white dwarf
Black dwarfs of black holes.
There are lots of white dwarfs; all the galaxies have them, including ours (the Milky Way).
A sphere.
I think white dwarfs. This is because they are much more low mass than black holes. White dwarfs are much more common in the universe than black holes, because we have only discovered a few black holes whereas we are aware of many white dwarfs.
No black dwarfs are thought to exist. The estimated time it takes for a white dwarf to cool to a black dwarf is greater than the current age of the universe.
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.
It is unknown. Scientists belive that, since the life length of white dwarfs are so long, there aren't any black dwarfs in our universe yet.