An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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dynamical time scale
  مرپل ِ زمانی ِ توانیک  
marpel-e zamâni-ye tavânik
Fr.: échelle de temps dynamique  

  1. The characteristic time it takes a protostellar cloud to collapse
    if the pressure supporting it against gravity were suddenly removed;
    also known as the → free-fall time.

  2. → crossing time for a stellar system like a galaxy.

See also: → dynamical; → time-scale.