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Black Dwarfs are still theoretical bodies in the Universe. Belief and scientific observations are two different things. In theory, they will exist, but until one is observed, there existence can not be confirmed. See related 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 are still theoretical bodies in the Universe. Belief and scientific observations are two different things. In theory, they will exist, but until one is observed, there existence can not be confirmed. See related 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.
their colour is one thing but a black dwarf originates from a white dwarf
Black dwarfs of black holes.
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.
The Bosporus Strait in Istanbul is usually considered the entrance to the Black Sea.
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.
There are more white dwarfs. Only the most massive stars can form black holes. White dwarfs form from low to medium mass stars, which far outnumber the supermassive ones.