An Etymological Dictionary of Astronomy and Astrophysics

English-French-Persian

فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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"nongravitational forces"
  "نیروهای ِ ناگرانشی"  
"niruhâ-ye nâgerâneši" (#)
Fr.: "forces non-gravitationnelles"  

The forces of jets from a comet’s nucleus that can cause a rocket-like effect and alter a comet’s direction of motion slightly.

See also: → non-; → gravitational; → force.