Ok so the thread I was looking at is closed and I cannot pose this question there. The question was posed if light will travel forever or if it will degrade over time and the answers that were given were a bit incomplete. Here is a link to that thread https://www.physicsforums.com/showthread.php?t=406527 This thread is pretty old, probably why its closed. I am new to the forums and this may be a redundant question but the short answer to the question was that it will travel forever without really saying why that is. Why would the energy of a photon not degrade or disperse as a result of increasing entropy with no other interactions on that photon?