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Let me ask you a simple question, are you reffering to 'back in time' as

A) Moving backward in the timestream, so you are going back in time
B) Moving the entire universe back to a previous state, making yourself the sole exception

If you chose A, I want to kill you. Time is just a concept, therefore only B is even remotely possible.

i think none is possible but idk >.<

For me it's just really hard to grasp the apparent "fact" that time is relative. I just... can't visualize it.

I believe Caltech did that.

Anyway, theoretically you could send a message back in time. The speed of light in a vacuum is time is measured by. If you are going the speed of light, time in relation to everything around you stops. You would reach your destination instantaniously. Math shows that it could be possible for light to move faster than itself in a vacuum. Which would mean that you could shine a laser at something, and it would arrive before you flashed the light on.

Time as we know it (seconds, minutes etc..) is a concept but actual time isn't, and it is only possible to go back in time as we know it.

B isnt possible because the universe is technically infinite.

Although time is a tricky subject because if you are at planet A then form your position planet B would be in the future, but if you were at planet B then planet A would be in the future.

You got that backwards, If you were on planet A then you would see planet B as in the past, and visa versa. And you can only travel ahead in time, unless you traveled everything else ahead in time and you stayed the same, but then you would just grow old really fast.

it's Heisenbergs theory of Uncertainty. If you dont know where it is its moving, and if you knowwhere it is it isnt moving.

(i was not talking about the theory of relativity)

Did you know that a russian astronaught orbited the world for 3 years and went into the future .00005 seconds?? (or somewhere around that)




I agree, the univers would be like a large circle. a very very very large one.

i also thought that no one had predicted the end of the universe (or length) anyway?



Ah, but you would HAVE to turn ON the light first yes?

or are you saying that you would turn go to turn it on, and it would already come out, because it travels backwards (or is that forwards) in time?

and if so, you could NOT press the button and light could come out, therefore changing what is ment to happen.. what would happen then?? or would maybe the light could like shift dimensions (but thats a whole 'nother discussion altogether)

The universe is technically finite but unbounded. It's like a sphere: you can keep going and going and going but you never get beyond it.

The light would reach the target destination before the emitted light was released, but at the spot where the light was released, the light would not come out of the laser until you pressed it. If you do not touch the button, no light will be released in the first place, and the other destination will not recieve the light.
It would be rather odd though, if you made the light shine at the operator of the button, so they would see whether they pushed the button or not before they actually pushed it. Gah!

When I said math, I meant the formula to it. Not every single bit of data on the computer. The formula to how a computer works is NO WHERE near as complicated. Sorry for the misunderstanding.

yep, he right

Impossible. Why? Simple. Time Travel Is Possible. Yet It Is Not Accessible.

That's a good way to put it.

Regardless of whether or not ANYONE can achieve time travel, it's pretty much impossible that we HUMANS can do it. "Pretty much" because logically the chance has to be between 0 and 1, exclusive.

If one traveled faster than light to travel back in time, wouldn't they just travel back in time till they werent going faster than light, and start going forward in time again?

nfi.

but theoreticly, i think your right. we'd have to be able to hit light speed first though, to be sure.. <_<