black dwarf
  • The postulated final, dark form of a white dwarf star, reached when all its heat has been radiated away. The black dwarf stage would take so long to reach that, even if the theory is correct, none may yet exist anywhere in the Universe. But since every star weighing less than 1.4 times the Sun’s mass is set to become one, there are going to be billions of them at some future point in the universe’s development, unless they are all swept up by the contraction of an oscillatory universe. A black dwarf would contain no nuclear or other activity recognisable by outsiders and would be detectable mainly by its gravitation.

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