SPACETIME CONTINUUM (the basics)

In physics, spacetime (also space–time, space time or space–time continuum) is anymathematical model that combines space and time into a single interwoven continuum. The spacetime of our universe is usually interpreted from a Euclidean space perspective, which regards space as consisting of three dimensions, and time as consisting of one dimension, the ‘fourth dimension‘. By combining space and time into a single manifold called Minkowski space, physicists have significantly simplified a large number of physical theories, as well as described in a more uniform way the workings of the universe at both the supergalactic and subatomic levels.

 

http://en.wikipedia.org/wiki/Spacetime

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