A Timeline of High-Energy Cosmic Rays History

Hess discovered cosmic rays 1912 Anderson discovered antimatter Debate over cosmic rays 1932 Auger discovered extensive air showers 1938 Fermi's theory of cosmic rays 1949 Proposal of GZK cutoff energy for cosmic rays 1966 AGASA high-energy event 1994		1927 Cosmic rays seen in cloud chamber 1937 Discovery of muon 1946 First air shower experiments 1962 First 1020 eV cosmic ray detected 1991 Fly's Eye detected highest-energy cosmic ray 1995 Pierre Auger Project begun