Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Built Environment (hierarchy name)
4. Settlements and Landscapes (hierarchy name)
5. landscapes (environments)
6. natural landscapes
7. extraterrestrial bodies

Anotations

Scope note:

Large groups of stars, existing as two primary types: globular clusters are tight groups of hundreds to millions of old stars which are gravitationally bound; open clusters are loosely clustered groups of generally young stars, containing fewer than a few hundred members typically.