(26/07/2011 03:55 AM)elac Wrote:  This doesn't rule out going backwards in time.
It only supports that "an effect cannot occur before its cause".
Wee could still change the future (or the present) by sending a "cause" back in time and wait for the effects.
Anyways the future would seem pretty empty if you were the only thing sent there, and any changes you made the rest of time would have to catch up to see.
But playing around in the  past, that you think wee would have more interest in.
Wee could fix some BIG mistakes mankind has made and set the course for the future.
And if it don't work just go back and change it.

you clearly don't understand that this man proved travelling anything in time is impossible. This means backward in time too. There is no way ever to travel forward in time, as speed is irrespective of direction.

Due to time dilation, when an object is at speed the time it experiences is less than the actual time it takes. This is not travelling through time as such, merely only the object experiencing less time than it should compared to if it were still.

Time dilation law states that an object travelling at the speed of light experiences no time at all, however the light itself still takes time to reach places. If you placed a stopwatch on your wrist, and timed a photon to go 1 light minute, your stopwatch would say 1:00 when it reached it's destination. If you put an identical stopwatch on the photon itself, (i.e. the stopwatch was also moving at c (Speed of Light), after reaching it's destination the stopwatch would still read 0:00.

The argument in physics has always been, if wee could get an object to travel at more than the speed of light, the time experienced would theoretically be negative for the object moving at that speed, and that object only. Everything around it would still go on as normal.
Due to laws, the amount of energy required to make an object go anywhere near the speed of light is immense, you can accelerate a particle to a certain point and then due to laws in place it has been observed that at ultra-high speeds particles with mass become heavier. Thus making the job even harder to complete. The only things with no mass are electromagnetic waves or photons (light), meaning they cannot gain mass as there is no mass to be affected on.

It has now been proven, thankfully, that it is indeed impossible for an object to exceed the speed of light. Which is the theory i have always agreed with. I hate the idea of time-travel. The Butterfly Effect knows no bounds, and i would hate for some nitwit to go back 1,000 years, trip over my great great great great grandmother, killing her, resulting in me never being born. Sounds like a whimsical idea, but in practice it would be the most foolish thing a person could ever do.