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As a consequence of the Lorentz transformations, time and space transform into each other when changing reference frame. This calls for a unified description: Minkowski spacetime.

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understand why there is a difference. Case 1: ...in the curved spacetime geometry in the vicinity of the Earth, the orbits of time translation symmetry differ from the geodesics of the metric. We …
asked Nov 27 '14 by yjc
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Quoting from Wald's GR: In the context of special relativity, the principle of general covariance states that the spacetime metric $\eta_{ab}$, is the only quantity pertaining to spacetime … structure which can appear in any physical law. What other quantities "pertaining to spacetime structure" are there, besides the metric? What would be an example of a (false) law or equation that would violate this principle? …
asked Nov 23 '14 by yjc