As I understand it, some billions of years ago, the universe used to be opaque (edge of the sun - orange colored). Due to the expansion of the universe, photons emitted billions of years ago from billions of light years away are just now reaching us with their wavelengths now shifted into the microwave spectrum. This is what we perceive as the CMB. It seems that the origin of CMB photons just barely lies inside our observable universe. Is this coincidence? Or is there some reason why it should be inside our observable universe? Will it eventually recede outside our observable universe, so that future physicists will look out into space and see no CMB?
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