Violation of the Greisen-Zatsepin-Kuzmin (GZK) Cut-off @ 6x1019 eV.

Problem: We should not see cosmic rays above 6x1019 eV. At above this energy, it becomes possible to interact with photons in the Cosmic Microwave Background (CMB).

• Cosmic rays above this GZK cut-off can travel at most ~100-150 million light-years before losing energy in such interactions.

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