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Cosmic Microwave Background

Last Modified: 2015-08-31
I checked few links about it as follows:
I see mentioned CBM discovered at different wavelength at different time moment as for example 3.2cm or 1.9mm or other values.
Why these differences? Which one is accurate or more important?
I cannot find anywhere, calculated or estimated the wavelength of the CBM radiation at the Big-Bang moment or at least at the age of 1s when the temperature is estimated 10 billion Kelvin.
Any help with CBM wavelength at that early stage of 1s?
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