An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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presolar grain
  دانه‌ی ِ پیش-خورشیدی  
dâne-ye piš-xoršidi
Fr.: grain pré-solaire  

A → refractory → nanoparticle embedded in → meteorites and → interplanetary dust particles whose → isotopic ratios suggest formation earlier than the Solar System.

See also: → presolar; → grain.