Whatever way we try to understand light it is indeed extrodinary that it seems to last forever.
How the energy is managed I have no idea..but how strange that we are able to "recieve" light as evidenced in some of the Hubble captures of light billions of years old..even if that light does not know it is that old
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I have read that if one calculates the "heating" effect of all the star light one will get a figure the same as that of the background radiation..I dont know what presumably overturned this idea..other than it did not suit the big bang theory.
alex