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space
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| "Space isn't remote at all. It's only an hour's drive away if your car could go straight upwards." – Fred Hoyle, Observer ( Sep. 9, 1979) |
2. (phys.) The three-dimensional theater in which things as we know them can exist or in which events can take place. In the Einsteinian worldview, space and time are united inextricably in a spacetime continuum and there is also the possibility of higher dimensions. See also fourth dimension.
• SPACE AND TIME
3. (math.) There are additionally many other types of space, most of them too abstract to imagine or to describe accurately in a few sentences. Generally, a mathematical space is a set of points with additional features. In a topological space every point has a collection of neighborhoods to which it belongs. In an affine space, which is a generalization of the familiar concepts of a straight line, a plane, and ordinary three-dimensional space, a defining feature is the ability to fix a point and a set of coordinate axes through it so that every point in the space can be represented as a "tuple", or ordered set, of coordinates. Other examples of mathematical spaces include vector spaces, measure spaces, and metric spaces.
• TOPOLOGY
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