Hubble constant

noun
Hub·ble constant | \¦həbəl-\

Definition of Hubble constant 

: a proportionality constant indicative of the rate of expansion of the universe that is used in relating the apparent velocity of recession of a distant galaxy and its distance

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History and Etymology for Hubble constant

after Edwin P. Hubble †1953 American astronomer

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hubble-bubble

Hubble constant

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hubbub

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