The universe has a closing time, and someone just moved it earlier

Almost all of time is the part after the stars go out.

Astronomers split the life of the universe into eras. We live in the first one, the Stelliferous Era, the age when stars shine. It runs from about a million years after the Big Bang to roughly a hundred trillion years from now. That sounds generous until you do the arithmetic. Shrink the whole star-lit era into a single year, and everything from the Big Bang until today fits into the first hour and a quarter of January 1st. All of recorded human history is about three milliseconds in. We are not living in the middle of things. We are the dew on the first morning.

Then the lights go out, not in a bang but slowly. The last Sun-like stars finish around ten trillion years from now. The longest-burning red dwarfs gutter out by a hundred trillion. After that, no new stars, only cooling embers: white dwarfs, neutron stars, and black holes drifting in the dark.

For a long time the textbook ending was almost comically far away. Black holes evaporate, atom by atom, through Hawking radiation, and the biggest would take about 10^100 years to vanish. That number is hard to feel. There are only about 10^80 atoms in the observable universe, so the lifespan of a large black hole, written out in years, is a bigger number than every atom in the cosmos.

Then in 2025 three physicists in the Netherlands showed something stranger. It is not only black holes that evaporate. Anything with mass does, because the curvature of space around it is enough to bleed it away. White dwarfs, the most stubborn objects, go in about 10^78 years. A neutron star or a stellar black hole, around 10^67. A human body, or the Moon, in about 10^90, if nothing else got there first.

So the ending moved closer, from 10^1100 years down to 10^78. Still unfeelable, but a thousand-digit number became a seventy-nine-digit one. And there is a quiet twist. The last predicted event used to be a final generation of explosions, “black dwarf supernovae,” around 10^1100 years. If everything evaporates by 10^78, those last fireworks never happen. The universe does not end with a bang after all. It ends with a slow shimmer, fading to nothing.

Which leaves the strangest comfort I know. The sky will not always be full. We were born early enough to see it lit.