## SPACETIME

### Spacetime

In physics,**spacetime**is any mathematical model that combines space and time into a single continuum. Spacetime is usually interpreted with space as existing in three dimensions and time playing the role of a fourth dimension that is of a different sort from the spatial dimensions. From a Euclidean space perspective, the universe has three dimensions of space and one 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.

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### Space / Time

"**Space**" and "

**Time**" are two mini-episodes of the British science fiction television series

*Doctor Who*. They were broadcast on 18 March 2011 as part of BBC One's Red Nose Day telethon for the charity Comic Relief. The two mini-episodes were written by the programme's head writer Steven Moffat and directed by Richard Senior.

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### spacetime

#### Noun

- The four-dimensional continuum of the three spatial dimensions plus time.
- An event is a point in
**spacetime**, specified by the coordinates x,y,z and t.

- An event is a point in
- An
*n*-dimensional continuum consisting of dimensions of both space & time. Normally spacetime is considered as having 4 dimensions (*x*,*y*,*z*,*t*), but higher-dimensional spacetimes are often encountered in theoretical physics, e.g. the 5-dimensional spacetime of Kaluza-Klein theory or the 11 dimensions of spacetime in M-theory. - A specific region of the universe with mathematically different properties than the surrounding spacetime. Synonymous with "metric" within the context of general relativity.
- "a Schwarzschild spacetime," "a Reissner-Nordstrom spacetime," etc. as opposed to sense (2) describing the universe's spacetime as a whole: "a Minkowski spacetime," "a 5-dimensional spacetime," etc.

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