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The star clusters they are local condensations of stars joined by gravitational forces that appear in the sky as concentrations of luminous points or even as dim nebulas.
According to their structure they are subdivided into open clusters and globular clusters.
The open clusters are found in the galactic disk, and are characterized by a stellar density a hundred times higher than that found in the regions surrounding the Sun; and yet, the stars that compose them are relatively scattered. The average diameter of the open clusters is approximately 10 light-years and the number of stars they contain varies from a few tens to a few thousand.
The globular clusters are characterized by a high stellar density and a high concentration of stars in the central part of the cluster, to the point that in many cases it is impossible, even with a powerful telescope, to distinguish each star from those that appear as a single light source These are less numerous than open clusters, but larger and richer in stars.
The open clusters contain stars of young and middle age belonging to the so-called Population I, similar to the stars that characterize the surrounding areas of our Sun. The globular clusters, on the other hand, are of ancient formation: about ten billion years.
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