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The Amaterasu particle, detected on May 27, 2021, by the Telescope Array (TA) observatory located in the state of Utah, United States, is the second most energetic cosmic ray particle ever recorded. It is named after Amaterasu, the sun goddess in Japanese mythology. The detected energy level was 244 exa-electronvolts (EeV), which is millions of times greater than the energy produced by human-made particle accelerators. Detection and Characteristics The Telescope Array is a system composed of 507