اسم ( noun )• : تعریف: any of the numerous small bodies once thought to have orbited the sun and coalesced to form the planets.
• of tiny cosmic bodies that are believed to have joined to form the planetstiny cosmic bodies that are believed to have joined to form the planets
فَلک السیارات Planetesimal اجرام سنگی کوچک و اولیه در قرص پیش سیاره ای که سیارات از برخورد آنها شکل می گیرند.+ عکس و لینک