In a previous post, I explain why the universe is probably not stable, but nevertheless unlikely to be intentionally destroyable even in the limit of advanced technology. Now let's turn our attention to more prosaic risks where exotic physics merely destroys the Solar System, Earth, or just outperforms traditional nuclear weapons on some more local scale.

The basic logic behind any bomb is a self-sustaining chain reaction, in which a carrier converts a unit of fuel and comes out the other side in surplus:

Two conditions make this run away. The reaction must release energy, so the products are more stable than the fuel; and each reaction must produce more carrier than it consumes, so that one reaction seeds the next. A practical third condition is that cannot be so unstable that it decays before the bomb is assembled.

False vacuum decay is the ultimate bomb: is the false vacuum, the empty space we currently inhabit, and is the true vacuum. Because the supply of false vacuum is effectively unlimited, the reaction grows without bound and destroys the universe.

Fission bombs run on the same principle at a more prosaic scale. Consider uranium-235. This [...]

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Outline:

(03:19) Nuclei are probably, but not definitely, stable within the Standard Model

(08:11) Positively charged strangelets are safe, neutral strangelets are not

(11:34) Strangelets would be hard to make

(13:33) Exotic physics could permit ways to destroy protons, but not autocatalytically

(16:01) Other forms of matter offer no plausible chain reaction

(18:50) Tiny black holes are not scary

(20:04) Conclusion: There are no super-weapons between the nuclear bomb and false vacuum decay

(21:56) Appendix 1: Igniting the Atmosphere

(27:53) Optically thick ignition

(29:09) Appendix 2: Let's throw a strangelet into the sun

(29:21) Neutral strangelet

(32:56) Positive strangelet

(33:58) Bonus: neutral strangelet meets Earth

The original text contained 5 footnotes which were omitted from this narration.

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July 3rd, 2026

https://www.lesswrong.com/posts/cBnCCKwwjQ4zZpeNQ/don-t-fear-the-strangelet

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Narrated by TYPE III AUDIO.

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