CalendarZ

  1. Home
  2. On This Day
  3. October
  4. 15
  5. Oh-My-God particle

Events on October 15 in history

1991Oct, 15

The "Oh-My-God particle", an ultra-high-energy cosmic ray measured at 40,000,000 times that of the highest energy protons produced in a particle accelerator is observed at the University of Utah HiRes observatory in Dugway Proving Ground, Utah.

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, Utah, U.S. It is the highest-energy cosmic ray ever observed.

This particle's energy was unexpected and called into question theories of that era about the origin and propagation of cosmic rays.

References

Choose Another Date

Events on 1991

  • 15Jan

    Gulf War

    The United Nations deadline for the withdrawal of Iraqi forces from occupied Kuwait expires, preparing the way for the start of Operation Desert Storm.
  • 16Jan

    Gulf War

    Coalition Forces go to war with Iraq, beginning the Gulf War.
  • 17Jan

    Operation Desert Storm

    Gulf War: Operation Desert Storm begins early in the morning. Iraq fires eight Scud missiles into Israel in an unsuccessful bid to provoke Israeli retaliation.
  • 9Apr

    Soviet Union

    Georgia declares independence from the Soviet Union
  • 5Oct

    Jakarta

    An Indonesian military transport crashes after takeoff from Jakarta killing 137.