“Cosmic rays are really sub-atomic
particles, being mainly protons (hydrogen nuclei) and occasionally
helium or heavier atomic nuclei and very occasionally electrons….”
“The Oh-My-God particle detected over Utah
in 1991 was probably a proton traveling at 0.999 (and add another 20 x
9s after that) of the speed of light…”
“…there are limits to just how far away an
ultra-high-energy particle can originate from – since, if they don’t
collide with anything else, they will eventually come up against the
Greisen–Zatsepin–Kuzmin (GZK) limit…”
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