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.