assuming you could travel back in time, this would mean there would have to be atleast two timelines of existence. Changing somthing in the past could potentially completely destroy the present timeline you traveled from to reach the past.
Lets say you went back and killed hitler. The change in the present time you came from, where millions of jews and people were slaughtered could not change instantaneously. you have have 80 year old jewish people appearing out of no where. you would have all the people that died in the war appear out of no where.
Lets say also you traveled back in time and changed somthing that prevented you from being born. this would change stop you from going back in time and changing the events that stopped you from being born in the first place, so the only thing you would have done is erase yourself from existence.
Time travel is an impossible theory. The closest thing we have to seeing in the future and past is the stars
/\ ah, but if, as you say, there are multiple timelines, then I can go back into the past and even prevent myself from being born, but then stay in that new timeline, as I have left the previous timeline when i went back in time, and thus, it is still intact and I am able to do the same thing again in an unending temporal loop.
but you would have never been born to be in the new timeline. now if your talking somthing like parallel universes or existences that would be different. Talking time travel though, if you did somthing to prevent your existence from ever occuring, then you couldnt exist in any time line, you never would have had the chance to travel back in time.
No it's not. Parallel universes are existences existing and functioning alongside of ours. travelling through time is just going from point A to point B in our existence but different times. A parallel existence to ours would already be different than what we are living now in our existence. It would be altered eigther minutely or greatly. Two different theories, but then again, i guess we will never know untill we are able to travel through different realms of existence and leap frog through time. Theoretically speaking if possible, time travel could already be a reality in one of our parallel existences.
How hard can time travel be? I mean al you need to do is connect two wormholes. lol