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Spacetime

In [physics] , ** spacetime ** (or * space–time; or space/time * ) is any [mathematical model] that combines [space] and [time] into a single [continuum] . Spacetime is usually interpreted with space being [three-dimensional] and time playing the role of a [fourth dimension] that is of a different sort from the spatial dimensions. According to certain [Euclidean space] perceptions, the [universe] has three [dimension] s of space and one dimension of time. By combining space and time into a single [manifold] , 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.

In [classical mechanics] , the use of Euclidean space instead of spacetime is appropriate, as time is treated as universal and constant, being independent of the state of motion of an observer. In [relativistic] contexts, however, time cannot be separated from the three dimensions of space, because the rate at which time passes depends on an object's [velocity] relative to the [speed of light] and also on the strength of intense [gravitational fields] , which can slow the passage of time.

** Concept with dimensions **

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