Globular cluster
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A globular cluster is a spheroidal conglomeration of stars that is bound together by gravity, with a higher concentration of stars towards its center. It can contain anywhere from tens of thousands to
Messier 2
NGC 7006 is a highly concentrated, Class I globular cluster.
The Messier 80 globular cluster in the constellation Scorpius is located about 30,000 light-years from the Sun and contains hundreds of thousands of stars.
NGC 2808 contains three distinct generations of stars. NASA image
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
Globular cluster
…like the Milky Way, they are mostly found in the outer spheroidal part of the galaxy – the galactic halo. They are the largest and most massive type of star cluster, tending to be older, denser, and composed of lower abundances of heavy elements than open clusters, which are generally found in the disks of spiral…
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