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The Oh-My-God particle 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. [1] [2] [3] As of 2025, it is the highest-energy cosmic ray ever observed. [4] Its energy was estimated as (3.2 ± 0.9) × 10 20 eV (320 exa-eV). The particle's energy was unexpected and ...
Upon impact with Earth's atmosphere, cosmic rays produce showers of secondary particles, some of which reach the surface, although the bulk are deflected off into space by the magnetosphere or the heliosphere. Cosmic rays were discovered by Victor Hess in 1912 in balloon experiments, for which he was awarded the 1936 Nobel Prize in Physics. [3]
Dubbed the ‘Amaterasu particle’, the cosmic ray has a power comparable only to the most powerful energy cosmic ray ever seen, dubbed the ‘Oh-My-God’ particle and spotted in 1991.
The gamma-ray burst was ten minutes long, [1] but was detectable for more than ten hours following initial detection. [2] [3] Despite being around 2.4 billion light-years away, it was powerful enough to affect Earth's atmosphere, having the strongest effect ever recorded by a gamma-ray burst on the planet.
Cosmic rays are charged particles that travel through space and rain down on Earth constantly. Low-energy cosmic rays can emanate from the sun, but extremely high-energy ones are exceptional.
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Previously reported extremely high-energy cosmic ray events include a 320 EeV particle in 1991 [5] (Oh-My-God particle), a 213 EeV particle in 1993 [6] [1] and a 280 EeV particle in 2001. [7] This makes the Amaterasu particle the third most powerful cosmic ray to have been detected.
Earth has been hit by a blast from a dead star so energetic that scientists cannot explain it.. The burst of gamma rays, originating in a dead star known as a pulsar, is the most high energy of ...