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Question about the change in cosmic microwave background radiation (may be physics?) Watch

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    If the universe became 'transparent' 360,000 years after the big bang at 3000K, why is CMBR measured at 2.726K today?
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    If the universe became 'transparent' 360,000 years after the big bang at 3000K, why is CMBR measured at 2.726K today?
    The expansion of the universe has red-shifted (i.e. stretched their wavelength and hence lowered their frequency and energy) the photons of the early universe from their original energy (when produced in a universe at around 3000K) to that of microwave frequency, hence why today we see them at this energy today.
 
 
 
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