In physical cosmology, the **cosmological constant** (usually denoted by the Greek capital letter lambda: Λ) is equivalent to an energy density in otherwise empty space. It was originally proposed by Albert Einstein as a modification of his original theory of general relativity to achieve a stationary universe. Einstein abandoned the concept after the observation of the Hubble redshift indicated that the universe might not be stationary, as he had based his theory on the idea that the universe is unchanging. However, a number of observations including the discovery of cosmic acceleration in 1998 have revived the cosmological constant, and the current standard model of cosmology includes this term.

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### Famous quotes containing the word constant:

“We must have more money, that’s all there is to it. There must be more money.”

—Anthony Pélissier. The *constant* complaint of the spendthrift Mrs. Grahame (1949)