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I have been having a discussion with a friend and I think we have reached the limit of our knowledge, so hopefully someone on here can help!
Basically the question is if a photon is emitted it will travel forever providing it never hits anything. So let's say we are close to the edge of the universe and we are a photon that is emitted, it travels forever and will never return, does this mean there is an effective life span of the universe where it will reach a state of max entropy and lots of energy will be "lost" as photons, kind of like a candle burning and eventually it dies?
Or does the whole universe constantly expanding (at the speed of light?) come into play and mean this will not happen? Eg the speed of the universe expanding (speed of light) + the speed of the photons leaving the universe (speed of light) = speed of light eg you can't go faster than c (c+c=c), so they effectively never leave, I get the feeling it is more complex than this though.
Perhaps me and my mates should stick to drinking games instead of theorising about the universe.
Also I apologise for any gross simplifications or incorrect understandings, please learn me. :)
Basically the question is if a photon is emitted it will travel forever providing it never hits anything. So let's say we are close to the edge of the universe and we are a photon that is emitted, it travels forever and will never return, does this mean there is an effective life span of the universe where it will reach a state of max entropy and lots of energy will be "lost" as photons, kind of like a candle burning and eventually it dies?
Or does the whole universe constantly expanding (at the speed of light?) come into play and mean this will not happen? Eg the speed of the universe expanding (speed of light) + the speed of the photons leaving the universe (speed of light) = speed of light eg you can't go faster than c (c+c=c), so they effectively never leave, I get the feeling it is more complex than this though.
Perhaps me and my mates should stick to drinking games instead of theorising about the universe.
Also I apologise for any gross simplifications or incorrect understandings, please learn me. :)