A Timeline of High-Energy Cosmic Rays History
1912 — Hess discovered cosmic rays
1927 — Cosmic rays seen in cloud chamber
1932 — Anderson discovered antimatter. Debate over cosmic rays
1937 — Discovery of muon
1938 — Auger discovered extensive air showers
1946 — First air shower experiments
1949 — Fermi's theory of cosmic rays
1962 — First 1020 eV cosmic ray detected
1966 — Proposal of GZK cutoff energy for cosmic rays
1967 — Haverah Park cosmic ray detector begins operations
1991 — Fly's Eye detected highest-energy cosmic ray
1994 — AGASA high-energy event
1995 — Pierre Auger Project begun
1999 — Groundbreaking for Pierre Auger South
2005 — Celebration and first physics results from Auger
2007 — Auger discovers extragalactic origin of highest-energy cosmic rays
2008 — Inauguration of completed Pierre Auger South
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