What is the term for a collection of 10 to 1000 young stars in a region about 80 light-years in diameter?

Name: What is the term for a collection of 10 to 1000 young stars in a region about 80 light-years in diameter?
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Open clusters are groups of a few hundred to a few thousand stars that were formed from the same giant molecular cloud and are roughly the same age. They are typically found in the disk of a galaxy and can be up to a few tens of light-years across.

What Is the Term for a Collection of 10 to 1000