# Cosmological constant

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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 [itex]c[/itex], the gravitational constant [itex]G[/itex], Plancks constant [itex]\hbar[/itex], the elementary charge [itex]e[/itex] and the permittivity of free space ε0.