I’ve never been able to understand this phenomenon. How is it proof of the Big Bang?
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So imagine that everything is milky. Air is milky, glass is milky, everything. It’d be really hard to see any light because it always gets blocked by something.
That’s basically what the universe was for the first 300,000 years or so. It was so hot and so dense that light couldnt get very far.
But at that 300,000 year point, the universe expanded enough that light started to be able to actually go places. The light we see from when that happened is called the CMB, Cosmic Microwave Background.
We have been able to look at this radiation because every moment of every day, more of it, coming from even further away, hits the Earth, having traveled for about 13.7 billion years before hitting anything.
As for proof of the Big Bang, it’s not really proof, it’s evidence that supports the Big Bang, because the Big Bang/inflation offers reasonable explanations for why we have this blanket of low energy radiation hitting us all the time.
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