All scenarios / Cosmic & speculative
False Vacuum Decay
Physics itself unravels at light speed. You won't feel a thing.
What it is
False vacuum decay is the idea that the universe isn't in its most stable state. If a bubble of a lower-energy vacuum ever formed, it would expand at nearly the speed of light and change the laws of physics inside it, destroying everything with no warning.
Why it ranks where it does
Measurements of the Higgs boson and top quark masses suggest our vacuum may be "metastable", meaning stable for now but not permanently. Calculations put its expected lifetime far beyond the current age of the universe. Because it would arrive at light speed, nobody would see it coming, and nothing could be done about it.
Evidence on the board
- Theoretically possible, cosmically unlikely, unstoppable if it happens. Don't worry about it.
What the experts say
Physicists consider this a real theoretical possibility that's cosmically unlikely on any human timescale. It's also why we only show it to three decimal places.
Could we survive it?
No. If a bubble of true vacuum reached us, the particles and forces that make up atoms would change, and everything would cease to exist in its present form, all at once. The upside, if there is one, is that it would be completely painless and we'd have no warning to worry about. A related fear, that particle colliders could trigger vacuum decay, was ruled out the same way as collider black holes: cosmic rays have already run far more energetic experiments throughout the universe.
What would move the number
Up
- New measurements that shift the Higgs stability calculation
Down
- Physics beyond the Standard Model that stabilizes the vacuum
Live signals we track
The baseline above is set from the evidence as of October 13, 2026. On the live board, your browser adjusts it in real time using these feeds. Chatter can only nudge a score in proportion to its evidence, so attention alone can't make an unlikely scenario look likely.
- Public attention: daily Wikipedia pageviews for False vacuum decay
- Online chatter: Hacker News stories mentioning "vacuum decay" this week vs. the prior eight weeks
Sources
- CERN Courier: The Higgs and the fate of the universe
https://cerncourier.com/a/the-higgs-and-the-fate-of-the-universe/ - Wikipedia: False vacuum decay
https://en.wikipedia.org/wiki/False_vacuum_decay
Baseline scores are an editorial threat index from 0 to 100 that combines current reporting with published expert estimates. They're meant for comparing risks, not as actuarial forecasts. See how the numbers work.