curvature of space
  • The property of space whereby, over large distances, it appears to obey the laws of spherical rather than plane geometry in terms of gravitation, the transmission of radiation, and other effects. The curvature of space is predicted by the General Theory of Relativity, and it implies, e.g., that two lines cannot be parallel over cosmically large distances – or precisely parallel over shorter ones Under relativity, it is not merely space but space-time which is curved. But space-time curves so gradually that experiments to discover the size and direction of the curvature are almost impossible to devise.

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