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Wikipedia: Space
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In physics, space is defined as a coordinate?s system where you can locate an object.
In Classical physics the space is a three coordinates euclidean system (x,y,z).
In Relativistic physics the space is defined as a four coordinates system (x,y,z,t). The fourth coordinate is time.
[Outer space]?is a location that is not adjcent to a planet or star, where the density? of molocule?s is lower than [standard atmospheric pressure]? and sometimes called a vacuum.