The Hubble law is an observation in physical cosmology which is widely considered as the first observational basis for the expansion of the universe. Edwin Hubble had predicted the notion that the universe is expanding at the calculable rate but it was Alexander Friedman in 1922 that first derived this rate from the general relativity equations which later came to be known as Friedmann equations. The Hubble constant is about 70 kilometres per second which have been found out through the redshift interpretation at of the different celestial objects from the Earth. Hubble's law has been found through the discovery of the linear relationship between redshift and distance when coupled with the linear relation between recessional velocity and redshift. The Hubble length or Hubble distance is a unit of distance in cosmology which is numerically estimated at 4,550 million parsecs or 14.4 billion light-years. It is obtained by multiplying the speed of light by the Hubble time.
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