What nuclear fusion mechanism does an isolated white dwarf use to generate energy?

Question

Quizplus · Accepted Answer

White dwarfs don't generate their own energy through nuclear fusion, as they have exhausted all their available nuclear fuel. The energy they emit is just the leftover thermal energy from their earlier evolution. White dwarfs do not generate their own energy through nuclear fusion. They are cooling remnants of stars that have exhausted all of their nuclear fuel.

What Nuclear Fusion Mechanism Does an Isolated White Dwarf Use