A group of stars that are gravitationally bound and formed in the same gas cloud. Open clusters are generally young (but not always) and can contain up to a few thousand stars.
The Pleiades (M45) is a famous bright open cluster visible from Earth.
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A group of stars that are gravitationally bound and formed in the same gas cloud. Open clusters are generally young (but not always) and can contain up to a few thousand stars.
The Pleiades (M45) is a famous bright open cluster visible from Earth.