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A comment on Atlas observes light scattering off light. Parent comment

Re:Atlas observes light scattering off light by marcosdumay on Sunday March 17, 2019 @11:31PM (#19418514)
If you are talking about [1], I think nobody knows how they are possible.

https://en.wikipedia.org/wiki/Oh-My-God_particle

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Re:Atlas observes light scattering off light by saagarjha on Sunday March 17, 2019 @11:35PM (#19418532)
That article links to a much better written one that appears to discuss this exact issue: https://en.wikipedia.org/wiki/Greisen–Zatsepin–Kuzmin_limit. Thanks!
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