Events on October 15 in history

Oh-My-God particle (October 15, 1991)

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.

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Events on 1991

15 Jan

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.
16 Jan

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

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.
9 Apr

Soviet Union
Georgia declares independence from the Soviet Union
5 Oct

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

Events on October 15 in history

Oh-My-God particle (October 15, 1991)

References

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Events on 1991

Gulf War

Gulf War

Operation Desert Storm

Soviet Union

Jakarta