In relativity, the space and time of the observer moving at the speed of light are different with the space and time of the observer at rest. At near the speed of light length contract and time dilate. Even motion is relative to the frame of reference used. An observer in accelerated frame view motion different from observer at rest. If we think deeper, even me and you are not in the same space. What I view in my space is different from what you view in your space. At least you can view me in your space while I cannot view myself in my space. Also, I can view you in my space while you cannot view yourself in your space. Is relative space not the union of absolute spaces?
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