An older name for these groupings is galactic clusters because they are found mostly in the disk, and especially the spiral arms, of this and other disk galaxies.
The stars in open clusters have formed together within the same interstellar cloud; indeed, in many diffuse nebulae, the birth of new open clusters can be seen taking place. As open clusters drift along, some of their members escape due to velocity changes in mutual closer encounters, tidal forces in the galactic gravitational field, and encounters with field stars and interstellar clouds passing their way.
Well known examples of open clusters include: globular clusters.
Related category• NEBULAE AND STAR CLUSTERS
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