the difference between the concept of time and the concept of spaceTIME.
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Spacetime is a four dimensional place where the Universe exists. Three of those dimensions are spatial (up/down, left/right, forward/backward) and one of those dimensions is time. It seems that everything is moving at a speed of 1 second per second in this time dimension, but at very high speeds in the other dimensions a limiting condition surfaces. Since it’s easy to transform between the spatial dimensions we’ve discovered that for very large speeds, the transformation also changes speed in the time dimension, slowing down clocks in what is called special relativity.
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