I don't think you quite grasp the concept of what time is as discussed in this topic. Firstly time is no more a creation of man than is physical space. Both are innate quantities in the universe, and are universal in accordance to physical laws.

Secondly no medium holds time, time IS the medium. And the measurements that we make, i.e. with clocks, measure the changes in this medium. Similarly no medium holds physical space, space is the medium in which we measure distances. As to what's beyond these, well there's just no concrete answer.

You could argue about the existence of higher layers of abstraction (what's beyond the universe?) but they're strictly in the realms of theoretical physics, such as string theory and the like, and is of a separate scope altogether.

I also disagree with the notion that time dilation is not a form of time travel--because it can be. Make it so that you travel fast enough (say, 99.9% of the speed of light), manipulate your own (perceived) travel time, and you can travel to (nearly) any arbitrary point in the future.

Travelling between time zones is not time travel. Time zones are artificial constructs, created so that our clocks are consistent (with respect to daylight, etc) anywhere in the world.

Also I have no idea what you're going on about.

Well yes, that is obvious. The term "time travel" as it is applied here in this topic is accelerated time travelling either backwards or forwards. In fact the term has, and always has been, referring to this very concept, regardless of context. I didn't think there would be any confusion surrounding the meaning.

This post has been edited by pixelsheep: Sep 24 2009, 12:06 AM