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Originally Posted by filtherton
There's temperature and luminosity and charge and mass and many more.
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Wait..... when did any of those become dimensions? Seems to me that several of those are measures of energy and fields.
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Originally Posted by hulk
Time is not 'the' fourth dimension. Time travel is easily possible - we're all doing it. Right now. Marching off into the unknown future. We can even control it, to a degree, by approaching the speed of light. If we were all two dimensional (and not just in personalities) we'd still be travelling through time.
If memory serves me, the most common description is that our universe has 3 spatial dimensions, and one time dimension. The 4D universe would have 4 spatial dimensions, but still one time.
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I think there might be a little confusion with definitions here... possibly due to the flash video. If something is a TRUE 2D object, it will not travel through time, it will simply exist, because it always has(i.e. its not traveling through time). When ever people try to explain 2D, such as the ant on the newspaper example, they incidently show you a 3D example with time being the third dimension as opposed to depth. Remember, its counting the dimensions involved, not labeling them. If there were a true 2D ant on a 2D newspaper, it wouldn't be able to go anywhere or do anything due to a lack of time to do it in. Unless it was a really weird ant that could somehow operate outside the dimension of time.