An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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hierarchical structure formation
  دیسش ِ ساختار ِ پایگانی  
diseš-e sâxtâr-e pâygâni
Fr.: formation de structures hiérarchiques  

A cosmological → structure formation model in which the smallest gravitationally bound structures (→ quasars and galaxies) form first, followed by → groups, → galaxy clusters, and → superclusters of galaxies.

See also: → hierarchical; → structure; → formation.