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How did we discover the cosmic microwave background radiation?
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I am curious how we discovered the (supposedly) remnants of the big bang. I understand that the CMB radiation spans the entire universe. How did we even begin to discover that? The universe is huge.

How accurate or precise is it when it comes to the age and formation of the universe? I just can't wrap my head around how we mapped microwave radiation throughout the entire observable universe. Am I just overthinking things?

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11 months ago