White dwarf stars

White dwarf stars are the remnants of medium-sized stars that have exhausted their nuclear fuel. After the star has burned out, it sheds its outer layers, leaving behind a hot, dense core about the size of Earth. These stars no longer undergo fusion, so they gradually cool and fade over billions of years. White dwarfs are incredibly dense, containing a mass comparable to the Sun but compressed into a much smaller volume. They are an important part of stellar evolution and can provide insights into the future of our own Sun.