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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, th30 KB (4,434 words) - 02:36, 13 December 2020
- ...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 b26 KB (3,930 words) - 23:56, 12 December 2020