Einstein's static universe, proposed in 1917, is a cosmological model introduced by Albert Einstein in response to the prevailing views about the universe during his time. Before the advent of modern cosmology, the universe was widely thought to be static and unchanging. To reconcile his general theory of relativity with the idea of a static universe, Einstein introduced the cosmological constant (denoted by the Greek letter Λ) into his field equations of general relativity.
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