What is the term for a collection of 100 to 1000 young stars in a region about 80 light-years in diameter?

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A collection of 100 to 1000 young stars in a region about 80 light-years in diameter is known as an open cluster. Herbig-Haro objects are clouds of gas and dust illuminated by young stars, globular clusters contain thousands to millions of stars, and giant clusters are not a recognized astronomical term.

What Is the Term for a Collection of 100 to 1000