The Fly's Eye cosmic ray research group in the USA observed a cosmic ray event with an energy of 3x1020 eV. Events with energies of 1020 eV had been reported in the previous 30 years, but this was clearly the most energetic.
The Fly's Eye cosmic ray research group in the USA observed a cosmic ray event with an energy of 3x1020 eV. Events with energies of 1020 eV had been reported in the previous 30 years, but this was clearly the most energetic.