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For a hypothetical proton lifetime of 10 37 years, Adams and Laughlin calculate that proton decay will raise the effective surface temperature of an old one- solar-mass white dwarf to approximately 0. For other uses, see Black dwarf disambiguation. They are estimated to be 11 to 12 billion years old. Articles with short description. They would, however, be detectable through their gravitational influence. Because the time required for a white dwarf to reach this state is calculated to be longer than the current age of the universe Look up black dwarf in Wiktionary, the free dictionary. Not to be confused with black holeblack star semiclassical gravityor neutron star. The name "black dwarf" has also been applied to substellar objects that do not have sufficient mass, less than approximately 0.