An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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evolutionary time scale
  زمان-مرپل ِ فرگشت  
zamân-marpel-e fargašt
Fr.: échelle de temps d'évolution  

The characteristic time it takes an evolving astronomical object to pass from a step to another.

See also: → evolutionary; → time scale.