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In [[physics]], '''spacetime''' is any [[mathematical model]] that combines [[space]] and [[time]] into a single construct called the '''spacetime [[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 than the spatial dimensions. According to certain Euclidean space [[perception]]s, 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 [[physics]], '''spacetime''' is any [[mathematical model]] that combines [[space]] and [[time]] into a single construct called the '''spacetime [[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 than the spatial dimensions. According to certain Euclidean space [[perception]]s, 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 [[context]]s, 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 the strength of intense gravitational fields which can slow the passage of time.[http://en.wikipedia.org/wiki/Space-time_continuum]

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 [[context]]s, 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 the strength of intense gravitational fields which can slow the passage of time.[https://en.wikipedia.org/wiki/Space-time_continuum]

[[Category: Physics]]

[[Category: Physics]]