The Hubble constant is the value that measures the rate at which the expansion speed of the Universe varies with distance.
To calculate this value, the speed with which a galaxy is moving away due to said expansion of the universe and its distance must be divided. Thus, the rebound speed of any very distant object is obtained by multiplying the Hubble constant by the distance that separates us from it.
The exact value of the Hubble constant is unknown, although independent measurements have established that it could be between 65 and 80 kilometers per second per megaparsec (one million parsecs, a distance equivalent to about 3.26 million light years). However, a recent estimate places this value around 70 kilometers per second per megaparsec, which would establish that the universe would be approximately 14 billion light years old.
