i don't understand how if you go faster then light you can travel in time?

Answer 1

As pointed out by other answerers, many of the equations of relativity give you imaginary numbers and negative times if you put in velocity magnitudes greater than the speed of light. However, if you could go greater than the speed of light, then relativity would be wrong and these equations would no longer be valid. One of the fundamental assumptions of relativity is that there is a finite speed of causality. All of the physics of relativity is contained in this assumption. The reason we believe this postulate is true is because it allows us to explain some previously unexplained phenomena in physics and allows us to describe our universe better. No influence can travel faster than this speed of causality by assumption. If a cause could travel faster than the speed of causality, then either we would have to raise the speed of causality to this new speed or if any speed is possible then one of the fundamental assumptions of relativity would just be wrong.

Answer 2

Currently the equations for relativistic motion and energy will produce imaginary numbers if the velocity of the particle in question is greater than the speed of light, so the physics of FTL travel will have to account for this. However, as you approach the speed of light, the kinetic energy of the particle tends to infinity, making it impossible to reach with current knowledge of physics. Of course, the faster the particle, the greater the time dilation, so it is possible to travel into the future faster than stationary objects.

Answer 3

All those dead people ain't gonna wake just cuz you decided to travel faster than the speed of light.

Going back in time?? Funniest thing i ever heard. No wonder Einstein's hair always look like it was on the same speed as light.

Answer 4

It's impossible for anything to travel faster than light; otherwise there would be a valid frame of reference in which something could arrive at its destination before it departed its starting point; that would be time travel, I suppose, but it's impossible because an experiment could be set up where the arriving object prevents its own departure, which would be a violation of causality.

Answer 5

Theororeticly its not possible to go faster then the speed of light, with out bending space or by conventional means of travel, IE. a spaceship. But if one were to travel at or greater then the speed of light you would age slower relitive to people on earth.

Answer 6

There are all kinds of theories about what would happen if you could travel faster than the speed of light. Since we can not travel that fast yet, they are all just theories.

Answer 7

Actually, Einstein pointed out that as you travel faster, nearing the speed of light, your relative time slows down. (That is, time for YOU, personally, slows down with respect to time for someone standing still, so my clock on a planet will move much faster than YOUR watch as you travel near the speed of light).

Others, based on Einstein's theory of relativity, theorized that if you actually REACH the speed of light, time for you stands still.

The theories continue by suggesting that if you go even FASTER than the speed of light, time starts moving in reverse for you.

The other theory is that the speed of light is absolutely the top limit possible.

Answer 8

I bet you are not going faster than light now. If you aren't travelling in time, what are you travelling through? Temperature?

Answer 9

watch the movie Primer. It's an awesome movie about time travel. They find a way back into time using the magnetic fields used by superconductors. They setup this box that you lay in to go back into time, but you can only go back to the point when you turned on the box and you have to stay in the box for the entire time you want to go back. It's a wild, brain-crushing movie.

Answer 10

nor do I