An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Hubble-Lemaitre parameter
  پارامون ِ هابل-لومتر  
pârânmun-e Hubble-Lemaître
Fr.: paramètre de Hubble-Lemaître  

The rate pf change of the → cosmic scale factor: H(t) = (dR/dt)/R. The Hubble parameter is a time-dependent quantity and therefore is not constant. The → Hubble-Lemaitre constant is the Hubble-Lemaître parameter measured today.

See also: → Hubble-Lemaitre law; → parameter.