Highest energy particle detected in nature

According to Official Guinness Records,

On 15 November 1991 the 'Fly's Eye' cosmic ray experiment in Utah, USA, detected an interstellar subatomic particle with an energy of 3.2x10**20 eV (roughly 50 joules or 12 calories). This is roughly the same energy as a fast-pitched baseball. The Fly's Eye experiment was built and operated by the University of Utah, USA.

For a complete list of 1991 records, please visit 1991 Guinness Records in United States.

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