* Black Dwarfs Don't Exist (Yet): A black dwarf is a theoretical object that forms when a white dwarf cools down completely and no longer emits any light. This process is predicted to take trillions of years. Since the universe is only about 13.8 billion years old, there simply hasn't been enough time for any white dwarfs to become black dwarfs yet.
* Distance is Irrelevant: Even if black dwarfs did exist, their distance from Earth would be irrelevant. Since they emit no light, we wouldn't be able to see them or measure their distance.
What We *Can* Talk About:
* White Dwarfs: These are the remnants of stars like our Sun. They are very dense and hot, but they gradually cool over time. Some white dwarfs are relatively close to Earth. For example, Sirius B, the companion star to Sirius, is a white dwarf. It's about 8.6 light-years away from Earth.
Let me know if you have any other astronomy questions!
