Hubble constant

== English == === Alternative forms === Hubble's constant === Etymology === After Edwin Powell Hubble, American astronomer === Proper noun === Hubble constant (astronomy) A number that expresses the rate of expansion of the universe; the velocity at which a distant object is receding from the Earth divided by its distance; its reciprocal determines the age of the universe. ==== Related terms ==== Hubble law ==== Translations ====