I have been writing a lot about time travel and what would happen not only once you time traveled, but when you went to come back. Would that be possible? You might of ended your own timeline by entering another time and therefore, your use to be present timeline has already been written for you and you can't go back to it since you left it. If you could visit the future, does that mean the future is actually already happening but it another dimension of time. The same goes for the past, if you went back to prevent John F Kennedy's death, does that mean the past is also happening right now but in another timeline? Also would this be right in your opinion, even if you went back and prevented presidents deaths, that would have nothing to do with your own present time because yours has already been written and that will only be affecting those of that timeline in that period. This may sound uneducated, but I'm pretty new to this kind of stuff and I'm only 18 years old. I'v been studying physic books and a couple theory of relativity books but I'm still no where close to most of you physicist on here and i want to be one when older after i study it in college at some point and earn a degree for it.