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Is the flux of cosmic rays now greater than it was in past eras of the Universe, less than it was in the past, or is it roughly the same? Is the answer different depending on what type of cosmic rays we are considering (lower energy, higher energy, protons, heavy nuclei, etc.?)

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  • $\begingroup$ For the last thousands of years we have C-14 and tree rings to measure the variation, that isn't a different 'era'. $\endgroup$
    – Jon Custer
    Commented Oct 26, 2022 at 14:42

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For the last 10,000-1,000,000 years, we have cosmic ray tracks and gas products in meteorites. There has been a bit of a shift in angular distribution over the sky over the course of years-decades, but even that’s degrees, not radians or cycles.

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