TFA: >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 https://en.wikip

TFA: >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 https://en.wikipedia.org/wiki/High_Resolution_Fly%27s_Eye_Cosmic_Ray_Detector https://en.wikipedia.org/wiki/High_Resolution_Fly%27s_Eye_Co...: >The High Resolution Fly's Eye or HiRes detector was an ultra-high-energy cosmic ray observatory that operated in the western Utah desert from May 1997 until April 2006 (...) >The HiRes discovered the Oh-My-God particle, an ultra-high-energy cosmic ray, on 15 October 1991 http://www.cosmic-ray.org/reading/flyseye.html http://www.cosmic-ray.org/reading/flyseye.html: >The new Utah experiment began observations in 1981 and was operated until 1993. A second detector site was completed in 1986. Interesting, some dates are clearly wrong here. I don't feel confident enough to edit the Wikipedia article, but I guess there were actually two observatories - the "old" one (1981-1993, detected the particle) and the "new" one (1997-2006)?