U ltrahigh-energy cosmic rays (UHECRs) at energies 1018 eV and above are the most energetic subatomic particles in nature. To get an idea of their energy, the most energetic of these particles carries the same punch (1020 eV) as a tennis ball coming off a racket with a speed of 100 km/h. For comparison, the Large Hadron Collider (LHC) at CERN can accelerate protons to only about 1013 eV. The tremendous energy of UHECRs naturally begs questions of how and where they are produced. Although discovered almost 60 years ago [1], the origin and chemical composition of UHECRs are still
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