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In many clouds visible as diffuse nebulae, star formation takes still place at this moment, so that we can observe the formation of new young open star clusters (composed of young Population I stars) - therefore, these nebulae are adequately called star-forming nebulae or star-forming regions.
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www.seds.org/messier/cluster.html
www.seds.org/messier/cluster.html
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Two main types of star clusters occur: the small and sparse open (galactic) clusters containing tens to thousands of young stars, and the large and dense globular clusters containing up to several million stars. Large-scale groupings of some stellar types are called associations.
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universe-review.ca/F06-star-cluster.htm
universe-review.ca/F06-star-cluster.htm
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Star cluster - Wikipedia, the free encyclopedia
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Star clusters or star clouds are groups of stars. Two types of star clusters can be distinguished: globular clusters are tight groups of hundreds of thousands of very old stars which are gravitatio...
en.wikipedia.org/wiki/Star_cluster
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Many stars in the universe are found grouped together as star clusters. Star clusters are groupings of stars held together by a common gravitational bond. They vary greatly in size and shape as well as the number of stars. ... Some of the stars in the universe are part of multiple star systems known as star clusters.
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www.seasky.org/celestial-objects/star-clusters.html
www.seasky.org/celestial-objects/star-clusters.html
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Open cluster - Wikipedia, the free encyclopedia
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An open cluster is a group of up to a few thousand stars that were formed from the same giant molecular cloud, and are still loosely gravitationally bound to each other. In contrast, globular cluste...
en.wikipedia.org/wiki/Open_cluster
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Observations of star clusters consist of performing photometry on as many individual stars that can be measured in a cluster. Each star is plotted by its color and magnitude on the HR diagram. Shown below is one such diagram for the globular cluster M13.
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zebu.uoregon.edu/~js/ast122/lectures/lec15.html
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Hubble has captured the most detailed images to date of open star clusters in a small galaxy orbiting our Milky Way. Such clusters contain thousands of stars all created from the same material and are excellent laboratories for studying stellar evolution. ... Astronomers recognize two basic types of star clusters:
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www.space.com/scienceastronomy/060418_star_clusters.htm...
www.space.com/scienceastronomy/060418_star_clusters.html
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