Strangelet Summer at Brookhaven
Wagner's 1999 SciAm Letter Asked Whether RHIC Could Birth a Mini Black Hole That Devours the Planet
The Sunday Times amplified the scare, Brookhaven convened a safety committee, and Relativistic Heavy Ion Collider runs left Earth intact.
What was claimed (paraphrase)
If this mini black hole remained stable, [it] could conceivably grow until it was big enough to "devour the entire planet within minutes."
— Walter L. Wagner (Scientific American letter, July 1999), amplified into a public RHIC doom scare · said Jul 1999 · due RHIC operations from 2000 onward (Earth still here)
RHIC began colliding ions in 2000. Brookhaven's safety review found 'no credible mechanisms for catastrophic scenarios.' The planet was not converted into a strangelet or swallowed by a lab black hole. Wagner later sued over the LHC instead.
The Story
Before the LHC had its day in court, Brookhaven had Walter Wagner's letter. A mini black hole, he worried in Scientific American, might grow fast enough to eat the planet in minutes — unless his energy math was wrong, which he helpfully flagged as a possibility. The Sunday Times ran with it. The lab's review board did not. RHIC switched on. Strangelets declined the audition.
Receipts
Wagner quote language as paraphrased/quoted in Berkeley California magazine from the July 1999 Scientific American letter. BNL: 'no credible mechanisms.' Sequel lives as lhc-black-hole-2008.
- Deus Ex Machina — Pat Joseph, California magazine; quotes Wagner's July 1999 SciAm letteraccessed 2026-10-24
- Black Holes at RHIC? — Brookhaven National Laboratoryaccessed 2026-10-24
As of Oct 25, 2026
since it didn't happen
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