Star cluster
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A star cluster is a group of stars, that share an origin, formed at roughly the same time and held together by self-gravitation. Two main types of star clusters can be distinguished: globular clusters
Messier 44, a cluster in the constellation of Cancer
The Pleiades, an open cluster dominated by hot blue stars surrounded by reflection nebulosity
The embedded Trapezium cluster seen in X-rays which penetrate the surrounding clouds
The globular cluster Messier 15 photographed by HST
Open cluster
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An open cluster is a type of star cluster made of tens to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age. More than 1,100 open clusters have be
The Pleiades is among the nearest open clusters to Earth
Mosaic of 30 open clusters discovered from VISTA's data. The open clusters were hidden by the dust in the Milky Way. Credit ESO.
The star cluster NGC 3590
NGC 265, an open star cluster in the Small Magellanic Cloud