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Hi
My understanding is that the CMB is directly and immediately resulting from the Big Bang itself. Not something generated later. Observed later of course, and much altered over time.
Effectively, there is no before that point in time, or outside the location the CBM originates from. I expect that neither of these statements are actually accurate, but, probably close enough for now.
I did read an article about how we are currently well positioned in time, to determine the origin of the universe. This relates to your 'Why is that?' question.
If you are interested, I will try to find it.
Philip
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