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Tiny dip could point to cosmic-ray origins New calculations by physicists in Europe could help reveal the origins of ultrahigh energy cosmic rays (UHECR). The work identifies a tiny but telltale feature in the UHECR energy spectrum that if verified experimentally should help astronomers determine how far UHECRs have travelled before they reached Earth (Phys Rev Lett 97 231101). With energies of 1018-1020 electron volts (eV) UHECRs are the most energetic charged particles in the universe.
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