What are the key concepts of General Relativity?

General Relativity is a fundamental theory of physics that describes the behavior of gravity and the geometry of space and time. Its key concepts include the notion that gravity arises from the curvature of spacetime by matter and energy, the equivalence principle that states that all objects fall with the same acceleration regardless of their mass or composition, and the possibility of spacetime singularities where the laws of physics break down. Other important concepts of General Relativity include the concept of geodesics that describe the shortest path between two points in curved spacetime and the theory of black holes, which are regions of spacetime where gravity is so strong that nothing, not even light, can escape.

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