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Oh-My-God particle
Ultra-high-energy cosmic ray detected in 1991
Oh-My-God particle
The Oh-My-God particle (as physicists dubbed it) was an ultra-high-energy cosmic ray detected on 15 October 1991 by the Fly's Eye camera in Dugway Proving Ground, Utah, United States. As of 2026, it is the highest-energy cosmic ray ever observed. Its energy was estimated as (3.2±0.9)×1020 eV (320 exaelectronvolt). The particle's energy was unexpected and called into question prevailing theories about the origin and propagation of cosmic rays.
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