Quote Originally Posted by mellow mood
screwedcork, time isnt the 4th dimension, what are u talkin bout?
Uh, yeah it is. We've got a total of four spacetime dimensions of macroscopic extent. Three of those are the familiar spatial dimensions: length, width and height. The fourth is the time dimension. There may actually be more than one time dimension just as there may be more than three spatial dimensions, although there is no evidence for it, and theory does not require another, currently. The unknown dimensions are believed to be microscopically curled up, so tiny, even a photon would be gigantic, by comparison. There are believed to be possibly another 7 of these curled-up dimensions for a total of eleven. This is all well-explained in Brian Greene's The Elegant Universe.