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Distance is a numerical description of how far apart things lie. In physics or everyday discussion, distance may refer to a physical length, a period of time, or an estimation based on other criteria (e.g. “two counties over”). In mathematics, distance must meet more rigorous criteria.

Physics

According to special relativity, distances through reality's time and space can only be measured as a spacetime interval. See the introduction to special relativity.

When not including time, distances through space are equal to the geometric formulas given below. These types of distances are also equal to the amount of (speed x time) required to move from one position to another. These formulas for distance could roughly be described as the relationship between dimensional differences, and force. For example, Gravity reduces proportionately to distance. It can, generally, be described as "how far apart things lie", because of this relationship.

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RT @sally_j: This 1951 film about direct-dial long distance is BURSTING with retro-fantastic telephones -> http://bit.ly/5k8ttd
maineroots (Rob Stanhope) Thu, 17 Dec 2009 23:13:30 -0000
RT @sally_j: This 1951 film about direct-dial long distance is BURSTING with retro-fantastic telephones -> http://bit.ly/5k8ttd
This 1951 film about direct-dial long distance is BURSTING with retro-fantastic telephones -> http://www.archive.org/details/Nationat1951
sally_j (Practical Archivist) Thu, 17 Dec 2009 22:47:08 -0000
This 1951 film about direct-dial long distance is BURSTING with retro-fantastic telephones -> http://www.archive.org/details/Nationat1951

 
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