22 replies to this topic

[Soul]

I got two words for you

Time Paradox

QFT!

I couldn't agree with you more.

[Mastermind]

Travelling forward it time faster than normal is possible, by speeding up, but to make a noticeable difference you would need to be going very fast. But to travel back in time you would need to be going faster than the speed of light, which is impossible, Tachyons can travel faster than light. So if you were to fire a tachyon at a target, it would hit the target before it was fired and you would not see it hit the target until after it did. If time travel is possible without going to parallel universes there is one massive problem with travelling back in time more than a few days, Temporal Paradoxes, the further back you travel the bigger the problem gets. What could be considered 'time travel' could be moving to a parallel universe that is maybe some time behind our universe, and not actual time travel. This would mean than any changes you were to make to that universe would have no affect on ours.

That would violate causality, which is impossible. Wikipedia has a nice article on Tachyons, which explains how they aren't really particles, and even though they move faster than light, they don't transmit information, so don't violate causality.

[Kyr Nelenar]

I don't think time travel will ever be possible (at least in the stereotypical view of casual time travel in many future shows/movies)... Outside of the light time travel (looking into space and seeing stars the way they were who knows how many billions of years ago...) and future traveling (going much faster than the speed of light...) there will never be traveling back in time... I say this because if at any instant in the future we were able to travel back in time, then we would have automatically have always had people coming "from the future"...