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...vity were found by [[Alexander Friedmann]], whose equations describe the [[Friedmann-Lemaître-Robertson-Walker]] universe, which may expand or contract. ...Roman Catholic]] [[priest]] [[Georges Lemaître]] independently derived the Friedmann-Lemaître-Robertson-Walker equations and proposed, on the basis of the recession of spiral nebulae, th

...y of spacetime. The geodesic paths for a spacetime are calculated from the metric tensor. * The [[Kerr metric|Kerr solution]] for rotating massive objects. This solution also produces b