4 ms·

I want to know more about that gamma-ray wall... - Would the CMB be so energetic (from the proton's frame) as to create electron-positron pairs? - If the part

I want to know more about that gamma-ray wall... - Would the CMB be so energetic (from the proton's frame) as to create electron-positron pairs? - If the particle can't travel more than 100m light-years, what happens to it? Does it slow down? Get destroyed? Is the answer markedly different from our reference frame vs the particle's?

smueller1234 9y ago
This is what happens: https://en.m.wikipedia.org/wiki/Greisen–Zatsepin–Kuzmin_limit https://en.m.wikipedia.org/wiki/Greisen–Zatsepin–Kuzmin_limi... To the second question: it loses energy due to pair creation (iirc, surely simplifying due to bad memory).