How long will humanity survive? It is one of the oldest questions in philosophy, religion, and science, yet it remains impossible to answer with certainty. While many discussions about humanity's future focus on threats such as climate change, pandemics, artificial intelligence, asteroid impacts, or nuclear conflict, some mathematicians have taken a completely different approach. Instead of predicting specific disasters, they have attempted to estimate the lifespan of human civilization using probability and statistics alone. One of the best-known examples is the "doomsday argument," first proposed in 1983 by astrophysicist Brandon Carter. More than four decades later, the controversial idea continues to spark debate after recent analyses suggested—with numerous assumptions—that humanity could disappear within roughly 17,100 years. While the estimate has captured widespread attention, scientists emphasize that it is a statistical thought experiment rather than a prediction of an actual catastrophe, Proof Positive reported.
The doomsday argument begins with a surprisingly simple concept known as the Copernican principle. Named after Nicolaus Copernicus, the principle argues that humans do not occupy a special or privileged position in the universe. Just as Earth is not the center of the cosmos, our place in the timeline of human history should also be considered ordinary rather than exceptional. In other words, if every human who will ever live were arranged on a timeline, any one individual should expect to occupy a roughly random position within that sequence, as per the report.
