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  "body": "\n## Summary\n\nThe Einstein field equations are the equations of general relativity.\nThey relate the curvature of a four-dimensional [[Lorentzian manifold|BY4QYYS788]], the spacetime, to the energy and momentum of matter in it.\nFor the metric they form a system of nonlinear second-order partial differential equations, which is hyperbolic after a suitable choice of coordinates.\nTheir solutions include the flat Minkowski space, the Schwarzschild black hole and the expanding cosmological models.\n\n## Explanations\n\n### L1 human\n\nGravity in Einstein's theory is not a force but the curvature of spacetime.\nMatter and energy tell spacetime how to curve, and the curvature tells matter how to move.\nThe field equations are the precise form of the first half of this slogan.\nEmpty, flat spacetime with no matter is the simplest solution, and the field around a single star or black hole is the next.\n",
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