An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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light-travel distance
  اپست ِ سفر ِ نور  
apest-e safar-e nur
Fr.: distance du voyage de la lumière  

The distance traversed by a photon between the time it is emitted and the time it reaches the observer. It is
also referred to as the → look-back time.

See also: → light; → travel; → distance.