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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That noise turned out to be the cosmic microwave background, the afterglow of the big bang fireball.

这一噪音最终被证实是宇宙背景微波，大爆炸的余辉。

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

CNN: Better 'baby picture' of universe emerges

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

ECONOMIST: Particle physics makes sense, but it assumes too much

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

FORBES: Cosmic Inflation Model Gets A Boost From Planck Data