As an expert in astrophysics, I can tell you that black dwarfs are the final evolutionary stage of small stars, specifically those with a mass less than about 8 times the mass of Jupiter. These stars, known as white dwarfs, cool gradually over time and eventually become black dwarfs once they have cooled to the point where they no longer emit significant amounts of light or heat. This process can take billions of years, and as of my last update, no black dwarfs are known to exist in the universe because the universe itself is not old enough for any white dwarf to have cooled to that stage.

read more >>

However, at less than 14 billion years old, the universe is still too young to have created any black dwarfs! A main sequence star that lacks the mass necessary to explode in a supernova will become a white dwarf, a 'dead' star that has burned through all of its hydrogen and helium fuel.read more >>