The distance between any two points in [Spacetime](Spacetime.md) is the so called _spacetime interval_ as defined by the [minkowski metric](Minkowski%20Metric.md#distance). Below we show a spacetime-diagram with the future and past [light cone](Causality.md#Light%20cone)s extending from the origin.  (Image adapted from Woit, P., _Quantum Theory Groups and Representations_) # Timelike and Spacelike separation The set of all points within the future and past [Light cone](Causality.md#Light%20cone) are said to be _timelike_ separated, while points outside of their respective light cones are said to be _spacelike_ separated. #Mechanics/SpecialRelativity