If current theories are correct, then all the stars will burn out within a million trillion years; all protons will decay within a million trillion trillion trillion years; and all black holes—even the supermassive ones—will evaporate within a million trillion trillion trillion trillion trillion trillion trillion trillion years. In other words, the universe is predicted to die in about a googol (10¹⁰⁰) years, give or take a factor of a million.