An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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expansion of the Universe
  سپانش ِ گیتی  
sopâneš-e giti (#)
Fr.: expansion de l'Univers  

The receding of galaxies from one another at a speed proportional to their separation, as inferred by Edwin Hubble from the observed Doppler shift of distant galaxies. → Hubble constant describes the local rate of the expansion.

See also: → expansion; → universe.