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The #Einstein field equations:

Rμν - ½Rgμν + Λgμν = (8πG/c⁴)Tμν

He believed the universe was static and eternal, so he added the term with Lambda (Λ) to keep it from expanding or collapsing, which would have worked for about five minutes maybe, and in 1929 Edwin Hubble published evidence it was expanding in any event, so Einstein dropped the term and purportedly told George Gamow it was the biggest blunder of his life. Then in 1998 two rival teams of astronomers published evidence the expansion of the universe is 𝘢𝘤𝘤𝘦𝘭𝘦𝘳𝘢𝘵𝘪𝘯𝘨 so in the end taking the Lambda term 𝘰𝘶𝘵 was an even bigger blunder! Nowadays cosmology is best described by ΛCDM, the Lambda/Cold Dark Matter standard model. #1123