1. Nov 25, 2011 #1

   Red monkey

   

   Would there be any energy loss at all from a beam of light travelling in a vacuum?

    

   Red monkey, Nov 25, 2011
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3. Nov 25, 2011 #2

   Bill_K

   

   Science Advisor

   Insights Author

   Nope. The energy of a light beam of course is frame dependent - can be red-shifted or blue-shifted according to the rest frame of the observer. But if you stay with the same rest frame and ask, does the light lose energy just because it has been traveling a long distance, the answer is no.

    

   Bill_K, Nov 25, 2011

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