I worked on the child and grandchild of this experiment, HiRes and Telescope Array as an undergraduate and a bit as a postgraduate at the University of Utah. Cu

I worked on the child and grandchild of this experiment, HiRes and Telescope Array as an undergraduate and a bit as a postgraduate at the University of Utah. Currently I work with the Fermi Gamma-Ray space telescope as a "science janitor". The reason it's called the Oh-My-God particle is because it kind of smashed through the GZK limit ( http://en.wikipedia.org/wiki/Greisen%E2%80%93Zatsepin%E2%80%93Kuzmin_limit http://en.wikipedia.org/wiki/Greisen%E2%80%93Zatsepin%E2%80%... ) There's a few particles near this energy hitting the earth every day, the flux is just very, very low. This is why the follow up experiments to HiRes and AGASA, the Auger and Telescope Array experiments, are very, very large. Most research has started to gravitate towards the lower energy cosmic rays, near 10^17 eV. I can talk more about this but I got to go for now. Experiments involved in UHECR research: http://en.wikipedia.org/wiki/Telescope_Array_Project http://en.wikipedia.org/wiki/Telescope_Array_Project http://en.wikipedia.org/wiki/High_Resolution_Fly%27s_Eye_Cosmic_Ray_Detector http://en.wikipedia.org/wiki/High_Resolution_Fly%27s_Eye_Cos... http://en.wikipedia.org/wiki/Pierre_Auger_Observatory http://en.wikipedia.org/wiki/Pierre_Auger_Observatory http://en.wikipedia.org/wiki/Akeno_Giant_Air_Shower_Array http://en.wikipedia.org/wiki/Akeno_Giant_Air_Shower_Array Fun facts about Dugway, home of Fly's Eye and HiRes: Some jets at Dugway once bombed a prototype detector. One of the HiRes detectors was just past some German Village buildings, which was a mock-up of a German village in the Utah desert used for weapons research in WWII.