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Depending on just how far back you go, there was a time the CMB was in the visible spectrum. However, in the era you're talking about, this is not the case, and compared to starlight and the primar...
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Depending on just how far back you go, there was a time the CMB was in the visible spectrum. However, in the era you're talking about, this is not the case, and compared to starlight and the primar...