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。
These variations caused minute differences in the temperature of the early universe, which we can see in the cosmic microwave background.
这些变化导致早期宇宙的温度瞬间不同，这些我们能在宇宙的微波背景上看出来。
But the groups who are critical of his work say that this is not what the cosmic microwave background is like.
但批评他的工作的这几组人认为宇宙微波背景辐射并不是这样的。
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