Time is the 4th dimension in a way; it has everything to do about relativity. It limits how fast information forces and you may travel in our Universe. What you see in your day to day life is actually the "past" catching up to you. It may not seem like it but thatâ??s because light (and forces) seems instantaneous, but it's not. It has a finite speed thatâ??s constant in any reference frame.

In your day to day life you can assume something is where it is because the speed of light is much greater then the speed of any car, bullet or anything with a considerable amount of mass (anything you can see basically.) But if you look off into space and view a star 10,000 light years away, youâ??re actually seeing it how it was 10,000 years ago. It may not even exist anymore but you wouldn't know that nor could you. So if you saw it go "Super Nova" you would know it happened 10,000 previous. However if you had the unfortunate luck to be right next to it, you would almost instantaneously.

Also you could only time travel if you went faster then the speed of light. But thatâ??s imposable, how can an object with mass travel faster then light with no mass? After all it would take an infinite amount of energy to accelerate a mass to the speed of light. Einstein proved all of this, and thatâ??s why he's so famous. Everyone used to think that it was respect to some either field, but it was never detected and it became obsolete once light was proved to have a constant velocity in any reference frame.

Once you get objects close to the speed of light weird shit happens, Super Luminal motions (which is an optical illusion), time dilation (moving clocks move slow, they had to account for this in GPS systems), and length contraction to name a few. It makes you think that even what we think is 3D is probably wrong.