* Black Dwarfs are the Remnants of White Dwarfs: Black dwarfs are the theoretical endpoint of white dwarf evolution. White dwarfs are the incredibly dense remnants of stars like our Sun that have exhausted their nuclear fuel. They slowly cool over trillions of years.
* Mid-Sized Stars Don't Become Black Dwarfs: Mid-sized stars, like our Sun, don't become black dwarfs directly. Instead, they evolve into white dwarfs.
* The Time Scale is Vast: The cooling time for a white dwarf to become a black dwarf is estimated to be longer than the current age of the universe (around 13.8 billion years). Therefore, no black dwarfs are believed to exist yet.
Summary:
* Mid-sized stars become white dwarfs.
* White dwarfs cool over trillions of years.
* Black dwarfs are the theoretical, extremely long-term, endpoint of white dwarf cooling.
Let me know if you have any other questions!
