: yanniru: : The inhomogeniuties in the 3K field did come from the amplification of quantum fluctuations at the moment of creation. But the moment of last scatter happened 300,000 years later and the 3K field we see today is just a 3000K snapshot of the inhomogeniuties in the universe at 300,000 years of age. : Greg: Why is this 3000K snapshot of the primordial Universe unaffected by the subsequent heat from the intense radiation put out by 15 Billion years worth of Galactic formation that has taken place since the moment of "last scatter"? Quasars and Black-Holes for example put out jets of extremely intense radiation along the poles, so how does the 3K environment remain unaffected by the heat from these jets along the lines of their transmission? If there is any affect at all, 15 Billion years worth of galactic formation would severly distort your 3000K snapshot, expecially when you are only talking about a difference of less then .0900 of a degree!

The light radiated by stars and other intensely hot sources have extremely small 3K components.