What is the ultimate, cold, dark fate of a white dwarf that continues to radiate away its stored energy?
Answer
Black dwarf
Over trillions of years, a white dwarf will radiate all its stored thermal energy, causing its surface temperature to drop until it no longer emits visible light, becoming a cold, dark black dwarf.

Related Questions
What type of pressure primarily supports a white dwarf against gravitational collapse?What is the approximate maximum mass a white dwarf can have before collapsing catastrophically?What chemical elements predominantly constitute the inert core of a white dwarf formed from a star like our Sun?Why does a white dwarf's degeneracy pressure not drive the core hot enough to restart fusion?What is the ultimate, cold, dark fate of a white dwarf that continues to radiate away its stored energy?What is the primary source of energy that makes a white dwarf luminous when first formed?What type of event occurs if a white dwarf accretes enough mass to exceed the Chandrasekhar limit?How does the pressure supporting a main-sequence star like the Sun differ from that supporting a white dwarf?What happens to carbon and oxygen during a Type Ia supernova explosion?Why have black dwarfs not yet been observed in the universe?