New answers tagged cosmic-microwave-background
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Why is the CMB's redshift so high?
Well during those periods we can assume universe is matter dominated. Thus, we can write $a(t) \propto t^{2/3}$. By also using $1+z = a^{-1}$, we can write.
$$\frac{1+z_{\rm CMB}}{1 + z_{\rm HD1}} = \...
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