The Doomsday Argument
You're an ordinary human, born at no special moment in our species' whole story. That single assumption — plus a little probability — puts startling limits on how long we have left.
How sure do you want to be?
Humanity's remaining time · 95% confidence
between 23 years and 35,100 years
It's a coin-flip we're gone within 900 years.
1
10
100
1K
10K
100K
now
Your birth number
№ 117,000,000,000
The last human is born
2,049 – 37,126
Humans who'll ever live
120B – 4.7T
Wait — is this real?
It's a genuine argument (J. Richard Gott, Brandon Carter, John Leslie) — and fiercely disputed. It hangs on treating yourself as a random human across our whole existence, and critics attack exactly that. Take it as a provocation about probability and self-location, not a prophecy.