Comment by scotty79

I've heard about interesting theory. Since we observe large early galaxies, to explain them scientists postulate that they must have grown very quickly. But recently some scientists calculated how much light would such quickly growing galaxies could have emitted. And it turned out that this light after being dispersed by the dust and redshifted by the expansion of the universe it should have contribute to CMB, up to 100% of it's observed intensity. What's interesting they didn't make any assumptions outside of established modern cosmology. Just So it's entirely possible that CMB is something completely different than what we believed.