= High Resolution Fly's Eye Cosmic Ray Detector
{wiki=High_Resolution_Fly's_Eye_Cosmic_Ray_Detector}
The High Resolution Fly's Eye Cosmic Ray Detector (HiRes) is an observational facility designed to study extremely high-energy cosmic rays, particularly those with energies exceeding 10^18 electronvolts (eV). It is part of a broader effort to understand the origins and propagation of ultra-high energy cosmic rays (UHECRs), which are among the most energetic particles in the universe.
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