Open cluster
Open cluster, in astronomy, any group of young stars held together by mutual gravitation. See star cluster.
This article was most recently revised and updated by Amy Tikkanen.
Citation Information
Article Title:
Open cluster
Website Name:
Encyclopaedia Britannica
Publisher:
Encyclopaedia Britannica, Inc.
Date Published:
09 November 2026
Access Date:
November 13, 2026