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Universe Is Expandin1 - Universe Is Expanding Georges...

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Universe Is Expanding Georges Lemaître and Albert Einstein In 1915 Albert Einstein published his Theory of General Relativity that described gravity as a curvature of spacetime (see the Relativity chapter ). In 1917 Einstein applied General Relativity to the universe as a whole and showed that the universe must either expand or contract. Since there was no evidence of such large-scale motion, he added a term to the equations called the " cosmological constant " to keep the universe static. Alexander Friedman (lived 1888 - 1925) in 1922 and then the Belgian priest/astrophysicist Georges Lemaître (lived 1894 - 1966) in 1927 (independent of Friedman) used General Relativity to show that the universe must be expanding. In his 1927 paper Lemaître suggested a relation between the galaxy speeds and distances like what Edwin Hubble would later observe. Einstein disagreed with Lemaître but Lemaître persevered. Einstein would later come to agree with Lemaître on the expansion of the universe arising from General Relativity after
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