David Kipping Recasts Fermi Paradox With 3-Parameter Model as 0.1c Spread Would Infect 99.9% of Universe
Updated
Updated · Universe Today · Jun 10
David Kipping Recasts Fermi Paradox With 3-Parameter Model as 0.1c Spread Would Infect 99.9% of Universe
1 articles · Updated · Universe Today · Jun 10
Summary
Columbia astronomer David Kipping proposed a Cosmological Hart-Tipler Conjecture that extends the Fermi-paradox debate beyond the Milky Way by modeling how technological "infections" spread across an expanding universe.
The framework uses three inputs—emergence rate, propagation speed and start time—and treats cosmic expansion as a drag on sub-light spread, yet Kipping found even 10%-of-light-speed waves can still produce heavily infected universes.
At a 0.1c spread rate, the model implies 99.9% of the universe would be infected if such expansion began in more than 1 in 100,000 galaxies, forcing the allowable spawn rate down to roughly 1 in 1 million galaxies over cosmic history.
That translates to fewer than 1 in 10 quadrillion star systems ever launching an expansionary program if our apparently uninfected surroundings are typical, creating one of SETI's tightest statistical constraints without proving aliens do not exist.
Kipping argues the result leaves both optimists and pessimists uncomfortable: either civilizations almost never expand, or some powerful Great Filter suppresses them at rates he says are hard to reconcile with current thinking.
Is the universe silent because advanced AI becomes a cosmic plague, or because wise civilizations contain their own technological creations?
A new model calls our existence a one-in-ten-quadrillion fluke. Are we truly that special, or just looking with the wrong eyes?
If aliens communicate with X-rays instead of radio, has our 50-year search for ET been pointed in the wrong direction?
The 1-in-10-Quadrillion Universe: Kipping’s Cosmological Hart-Tipler Conjecture and the Stark Odds Against Detectable Alien Life
Overview
In June 2026, Professor David Kipping introduced the Cosmological Hart-Tipler Conjecture (CH-TC), a new model that updates our understanding of the Fermi Paradox by focusing on the spread of advanced technological civilizations, or 'artificial infections,' across the universe. Unlike previous models, Kipping’s approach uses a simple equation that considers how these civilizations emerge, propagate, and the time available for their expansion. A key innovation is the explicit inclusion of cosmic expansion, which acts as a barrier to intergalactic spread. This fresh perspective highlights how the universe’s growth may limit the prevalence and detectability of extraterrestrial life.