# Spacetime

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**Spacetime** is the combination of three-dimensional space and the dimension of time to form a four-dimensional universe.

Until the theory of relativity, it was possible to study space and time separately. In the early 1900s, Poincare, Minkowski, and Einstein showed that the concepts of space and time are actually intertwined, and that one could only truly make sense of spacetime as a whole. Gravity is best understood as a manifestation of the curvature of spacetime.