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By 1929, however, the work of Hubble and others had shown that our universe is expanding.This is readily described by the expanding cosmological solutions found by Friedmann in 1922, which do not require a cosmological constant.

General relativity also predicts the existence of gravitational waves, which have since been observed directly by physics collaboration LIGO.Lemaître used these solutions to formulate the earliest version of the Big Bang models, in which our universe has evolved from an extremely hot and dense earlier state.During that period, general relativity remained something of a curiosity among physical theories.These equations specify how the geometry of space and time is influenced by whatever matter and radiation are present, and form the core of Einstein's general theory of relativity.


The Einstein field equations are nonlinear and very difficult to solve.Einstein used approximation methods in working out initial predictions of the theory.


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