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`H_o = 70.8 (km) / s/Mpc`

70.8

**Hubble Constant**: 70.8 km/s per mega-parsec.

The Hubble Constant is the unit of measurement used to describe the expansion of the universe.The value of the Hubble Constant is important for both observations of the objects in the Universe, as it allows us to convert their recession velocities into true distances, and for estimating the age of the Universe.Hubble Constant has units of km/sec per megaparsec (km/s/Mpc).

the 1920's, Edwin Hubble working with observations from the Mount Wilson Observatory discovered that the Universe is expanding. He compared recession velocities of galaxies measured from their spectra to their apparent brightness estimated from photographic plates. This expansion causes objects at greater and greater distances to be receding from us at higher and higher speeds, at a velocity given by an expression now known as Hubble's Law: V = H x R. Here V represents the galaxy's recessional velocity, R is its distance away from Earth, and the constant of proportionality, H, is called the Hubble Constant and has units of km/sec per megaparsec (km/s/Mpc). The value of the Hubble Constant is important for both observations of the objects in the Universe, as it allows us to convert their recession velocities into true distances, and for estimating the age of the Universe.

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