A group of one hundred to a few thousand stars in a region of 25 pc in diameter that were created at the same time and our bound together by gravity is called a(n) ____.

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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 bound by mutual gravitational attraction and are typically found in the disk of a galaxy, such as the Milky Way. They are relatively close together in space and are often observed within a region up to a few tens of parsecs across.

A Group of One Hundred to a Few Thousand Stars