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yuti — November 9, 2007 / 6:42 pm
In Newtonian physics space was held to be uniform and three-dimensional, obeying the geometrical laws of Euclid. It was physically inert, infinite in extent, continuous and infinitely divisible. For Newton it had an absoluteness which he thought of as God-given. These premises were overthrown by Einstein, with the possible exception of its infinity and infinity divisibility. Certainly the commonsense notion of juxtaposition cannot be understood coherently when absolute simultaneity is also denied, as it was by Einstein. Indeed, our intuitively separate concepts of space and time become inextricably interwoven and mutually defined in relatively theory, now completely accepted in modern physics. Not only do the space measurements in one system determined by an observer moving relative to it depend on time differences, but also mutatis mutandis the time measurements made by such an observer on the same system involve space measurements. So modern relativistic physics adds to our intuitive spatialization of time a dynamization of space.
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