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.
1) safar (#); 2) safar kardan, safaridan
Fr.: 1) voyage; 2) voyger
1) The act of traveling, especially to a distant place.
M.E. from travailen "to make a journey," originally the same word as Fr. travail "work, labor" (by shift to "make a laborious journey").
Safar, from Ar.
(British: traveller) A person or thing that travels.