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Date: November 23, 2023 02:49PM
Mysterious cosmic rays observed in Utah came from beyond our galaxy, scientists say
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https://www.cnn.com/2023/11/23/americas/powerful-cosmic-ray-amaterasu-particle-detected-scn/index.htmlThe recently discovered particle, nicknamed the Amaterasu particle after the sun goddess in Japanese mythology, was spotted by a cosmic ray observatory in Utah’s West Desert known as the Telescope Array.
The Telescope Array, which started operating in 2008, is made up of 507 ping-pong table-size surface detectors covering 700 square kilometers (270 square miles).
It has observed more than 30 ultra-high-energy cosmic rays but none bigger than the Amaterasu particle, which struck the atmosphere above Utah on May 27, 2021, raining secondary particles to the ground where they were picked up by the detectors, according to the study.
“You can look …(at) how many particles hit each detector and that tells you what the energy of the primary cosmic ray was,” Matthews said.
The event triggered 23 of the surface detectors, with a calculated energy of about 244 exa-electron volts. The “Oh My God particle” detected more than 30 years ago was 320 exa-electron volts.
For reference, 1 exa-electron volt equals 1 billion gigaelectron-volts, and 1 gigaelectron volt is 1 billion electron volts. That would make the Amaterasu particle 244,000,000,000,000,000,000 electron volts. By comparison, the typical energy of an electron in the polar aurora is 40,000 electron volts, according to NASA.
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