宇宙微波背景（cosmic microwave background radiation），散布于宇宙空间的微波辐射，显示了自大爆炸之后，宇宙在不断冷却的事实。
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。
UHECRs tend to collide with photons of the cosmic microwave background—pervasive radiation that is a relic of the early universe.
而暗能量的首要证据也并非来自宇宙微波背景。
And the prime evidence for dark energy doesn't come from the cosmic microwave background, either.
这个标记就在宇宙微波背景之中，就是充满整个宇宙的射线。
The imprint in question is in the cosmic microwave background (CMB).this is a bath of radiation that fills the whole universe.
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