# Cosmological constant

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## Revision as of 12:38, 31 January 2007

Cosmological constants (also known as physical or universal constants) are observed and measured values for naturally occurring phenomena. These include, but are not limited to, the speed of light in a vacuum *c*, the gravitational constant *G*, Plancks constant ℏ, the elementary charge *e* and the permittivity of free space ε_{0}.