I think 'dragontamer read the question as "why does the photon move away from it at the speed of light?" (as I did). There isn't really an answer to that questi

I think 'dragontamer read the question as "why does the photon move away from it at the speed of light?" (as I did). There isn't really an answer to that question, since it's just the way the universe works. Saying that the laws of the universe don't (or can't) have explanations is not the same as saying they are intuitive to everyone. Ultimately, some of those facts you just have to accept. It is extremely difficult to have any useful analogy or explanation that attempts to explain why light always travels at the speed of light in any reference frame. The consequences can definitely be explained well, but the fundamental laws really can't. EDIT: John von Neumann's quote about math reflects my view about this kind of fundamental physics: > in mathematics you don't understand things. You just get used to them.