Well, time is not dimensional, space is. (space)Time is sometimes called the fourth dimension. So in addition to the three non-relativistic spatial dimensions of space i.e. width, height, and length we can add 'spacetime' as a fourth dimension. When Einstein demonstrated by elegant theory that time was relative, and wrote his papers concerning relativity (to the observer) space/time was born. I want to give credit to Kurt Godel as well as big E. He is almost always ignored even though he was instrumental to Einsteins theories. Godel proposed that if the universe was rotating time travel would be possible so maybe it was Godel that prompted Einstein to pursue his theories? Just a thought.
Special relativity shows that time behaves somewhat astonishingly like the three spatial dimensions. Lorenz equations demonstrate indicate that. Length contracts as speed increases. Time expands as speed increases. Space became linked with time, and are the components of time dilatation. When length contracts and time expands its fairly easy to see how time dilation ie time travel can work at relativistic velocities ie any speed above 99% light speed although there is no set value on relativistic velocities, its a general term.
In my opinion it's only because of big Al's big brain and his beautiful imagination and masterful grasp on geometry and physics that time, spacetime specifically, is now recognized as the fourth dimension. I hope I did not bore everyone to death but I wanted to provide some back ground info so it might be easier to understand why 'timetravel' is indeed possible and has already been accomplished on a very small scale. (the space station astronauts are a fraction of a second younger than they would be if they had spent their entire lives on earth due to time dilation of the slow velocity (compared to relativistic velocities) of the international space station. This has been confirmed by atomic clocks. Two synchronized atomic clocks also confirmed that mass (gravity generated by mass) also 'slows down' time. As does velocity etc (according to an observer).
In fact if we built a space craft that was capable of say, 99.9 % the speed of light and this craft left earth and went to the nearest star (around 25 light years my memory fails me) then returned to earth, the astronauts would have aged a few decades while earth would have aged thousands to millions of years depending on the final percentages of speed. According to science 100% light speed would be impossible because as velocity increases so does the mass of the object being moved. Attempting 100% light speed can not be done because there is not enough energy in the entire universe to attain 100% the velocity of c. There may be shortcuts to faster than light travel such as warping space or entering a rotating black hole but those are pie in the sky science fiction proposals even if theoretically possible.
I hope this helped. Any of the claims made in this reply can be confirmed by validating with a search engine. I would be happy to clarify or expand on any claim made, even though its all from my faulty memory.....
Last edited by RevAnarchist; Jun 13 2012 at 10:38 PM.
“"Woe is me, for I am ruined. For I am a man of unclean lips, and I dwell in the midst of a people of unclean lips. For my eyes have seen the King (of earth), the Lord of hosts!" Isaiah 6:5 .