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Bascilly the question i want to ask is where does it end if time travel can happen then what is this reality we are in are we the future the past or the present. Another question is if we are the past then what is the future and is it already set, you see thats where i have a problem with the time travel theory it simply is an unacceptable law of the universe. Perhaps the reason why time travel is not possible is becasue once a moment happens or an act its done and finished, perhaps the only way to change past actions would be to influence the situation and manipulate it to an acceptable level.

Not if you view it as past, pres., and future all running simultaneously..with different realities and dimensions to it.

Thats what I think ! That time travels is only possible if we assume we are traveling to a "past" of palallel universes instead of our own past, just like I said in the other thread, and just like some physicists think.

Silly thread.

Originally posted by Atlantis001
Thats what I think ! That time travels is only possible if we assume we are traveling to a "past" of palallel universes instead of our own past, just like I said in the other thread, and just like some physicists think.

Well I guess you and I are the intelligent ones... Physics.

Past, present and future depends on the observer. Thats some mojo from Einsteins Theory of Relativity.
YOUR present doesn’t diverge too much from mine as we’re both on Earth. So if you travelled BACK in time, you’d be in MY PAST, but MY past would be YOUR present.
But what if you killed your grandmother? Then you wouldn’t be born, didn’t travel back… and then there’s a paradox.

Nope, the future isn’t set yet. That’s what’s makes it the future. All choices and possibilities are open – your choosing this or that door, and electron playing wave or particle…
So past, present and future is RELATIVE to whomever is doing something, observing something or conducting an experiment.
Stating that time-travel “simply is an unacceptable” law of the Universe assumes Newtons view of the whole thing with an ABSOLUTE time, a time that is defined all over the Universe an ticks away and shows the same time – no matter where you are. That absolute time does not exit – Einsteins doing.

You COULD argue, that if timetravel is possible, then we humans should be able to invent it some day. So where are all the time-tourists? (Hawkings argument). Heck, we should be knee-deep in people from the future wanting pictures.
2005 is maybe not very exiting? Lame argument.
Maybe they were already there, in the past, the time-tourists, and changed what they wanted… Who knows?

We have four dimensions in our Universe. Three spatial, and one temporal. To cause change in the three spatial ones, time must pass, energy be spent.
The idea that time-travel causes the creation of parallel Universes sounds exiting – but where does the energy to create these Universes come from I ask?

However – if timetravel is NOT possible, then the Universe is actually five-dimensional instead of four-dimensional.

What does that mean?