GZK Cutoff ·
Cosmic Speed Limit
un
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.com · UHECR · photopion · CMB horizon
Proton energy
3.2×10²⁰ eV
Distance
0 Mpc
Stage
—
UHE proton
CMB photon (2.7 K)
Δ⁺(1232) resonance
Emitted pion
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