Which statements are true of a white dwarf?

Answer 1

A white dwarf is the remnant core of a star that has exhausted its nuclear fuel and shed its outer layers, typically after a red giant phase. These stars are characterized by their high density and low luminosity, as they no longer undergo fusion reactions. White dwarfs gradually cool over time and will eventually become cold, dark remnants known as black dwarfs, although the universe is not old enough for any black dwarfs to exist yet. They primarily consist of electron-degenerate matter, with carbon and oxygen being the most common elements.