The Modern World

The scientific endings are the only ones in the record with no author. In an open universe, as Freeman Dyson set out in 1979, stars exhaust their fuel, galaxies disperse, matter decays, and the available energy gradients flatten until no process can extract work: heat death, arrived at by thermodynamics rather than by decision. Adams and Laughlin later organised the same trajectory into cosmological decades, a schedule of stelliferous, degenerate, black-hole and dark eras extending past 10^100 years.

Two alternatives depend on unsettled physics. If the dark-energy equation of state is more negative than minus one, the phantom-energy case set out by Caldwell, Kamionkowski and Weinberg, expansion becomes strong enough to tear apart galaxies, then stars, then atoms, at a finite date they calculated for one parameter choice as roughly twenty billion years out. If instead expansion reverses, the universe contracts to a Big Crunch. Which ending applies is an empirical question, and the current measurements do not settle it.

The structural resemblance to the older material is exact and worth stating plainly: a sequence of named ages, monotonic decline, a terminal condition. What is missing is everyone the older stories were addressed to. There is no judge, no remnant, no meaning assigned to the outcome, and no audience at the far end. The mechanisms are treated in The Heat Death: the End Without a God and The Big Rip and the Big Crunch: the Geometry of the End, the framework in Scientific Eschatology (The Secular End). Set against Modern Manufactured Apocalypticism, where dates are asserted and then quietly moved, the physical endings differ in the one respect that matters: their timetables are revisable in public, on evidence, by people who say so.