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Re:Atlas observes light scattering off light by cozzyd on Monday March 18, 2019 @01:04AM (#19418794)
They're not gamma rays :)

But a similar limit happens to protons (the GZK limit at 50 EeV, where protons and CMB photons can make a Delta+). For heavier nuclei, photodisintegration will happen at even higher energies.

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