UHECRs tend to collide with photons of the cosmic microwave background—pervasive radiation that is a relic of the early universe.
UHECRs 往往会与宇宙微波背景中的光子相撞，这种辐射是早期宇宙的遗迹，无处不在。
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Not only has exposure to microwaveradiation been linked to causing infertility in men, but it also denatures many of the essential proteins in foods, rendering them virtually indigestible.