Time travel question

[ZLBilley]

As far as we can tell, causality only happens forwards... so if someone were to travel back in time, then the the state of having travelled back in time would cause the time machine to send them back at some time in the future, and not the other way around. And since there would be nothing that would actually cause them to be in the wrong time in the first place... well, time travel really wouldn't exist, now would it?

[Dean]

I hope I can pull this off properly, First of all, Time Travel is full of paradox, its like a cube shaped Chess game, most people are almost instantly thrown into a mad foaming to think of it, it definately, ALWAYS has strange permutations. Secondly, if you were going to work on a time travel scenario you would most surely need a massively parrallel super computer just to put up even a front of serious treatment of time paradox with any real time accuracy? Thirdly, if You knew of such a computer and could get time on it, what are the chances you would find the builders of the computer who constructed it for just such an application but are befuddled by your discovering it and asking to borrow it for the afternoon...........Its sure to have been a super secret.....because if it worked, you would never hear about it in any of the local journals, because with it you could control the very fabric of any intruders existance? whew, not exactly all I wanted to say, could I have some more time and a fresh cup of pencils?

[Julio Clearsky]

For Time Travel read Cloud Atlas

[topspin]

Another newbie here, so im just gonna jump right in.
If your time travel 'method' involves physically moving yourself and your time travelling vessel into the past, you and it will be affected if you change stuff that effects the journey in the first place.
If your time travel method involves creating an exact duplicate of yourself in the past (out of native particles) with all the properties that you yourself have now then anything you do in the past may change the future, but not the duplicate you sent back, since it is 'of' that original time.
Don't quote me on any of that, because it may turn out to be utter nonsense.

[steve12553]

There is a concept of quantum physics, that I don't expect to ever fully understand, that says that all possible options happen all at once iin parallel. It be be that if you were to go into the past and change something that the change may just happen in a parallel timeline or dimesion where the future was going to work out that way anyhow. For example, if you were to kill your past self then the result would happen in a timeline where you died at that point anyway and didn't affect the future. Now that I've made myself clear as mud...........................