Hi I'm new and an idiot so please don't burn me, I wouldn't have come to a specialist forum if I could have found the answer in a more mainstream place. Anyway, can somebody please explain to me in layman's terms why, if one could travel faster than the speed of light, they'd go back in time. Because in my mind, if I went faster than the speed of light, I'd just be seeing that bit of light a bit sooner than everybody else, and since all light looks the same, it wouldn't really look any different. It's bugging me a bit because I really can't get my head round the fact that, if I could switch on my light and go and sit down before that light hit my chair, I'd be sat down before I switched the light on. I meant, what does light have to do with anything anyway? If in some crazy world we could have been here without any light at all, without light existing, would time travel still be possible then? I meant I just don't see why light is so fundamental to everything, it's just a thing that illuminates stuff why is light the master of the universe. Arrggghh.