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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And the prime evidence for dark energy doesn't come from the cosmic microwave background, either.

而暗能量的首要证据也并非来自宇宙微波背景。

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This cosmic microwave background radiation, they said, represents the ancient afterglow of the big bang.

他们说，这宇宙微波背景幅射代表着宇宙大爆炸的余辉。

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Planck represents the third generation of attempts to map the cosmic microwave background.

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It is these photons, now massively red-shifted, that form the cosmic microwave background.

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At the risk of oversimplifying, this is the lack of noticeably non-random fluctuations in the cosmic microwave background spectrum measured by Planck.

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