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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Pleiades (star cluster) - Wikipedia, the free encyclopedia
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In astronomy, the Pleiades , or seven sisters, (Messier object 45) are an open star cluster containing relatively young hot blue stars located in the constellation of Taurus. It is among the nearest...
en.wikipedia.org/wiki/Pleiades_(star_cluster)
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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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In many clouds visible as bright diffuse nebulae, star formation still takes place at this moment, so that we can observe the formation of new young star clusters. The process of formation takes only a considerably short time compared to the lifetime of the cluster, so that all member stars are of similar age.
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www.seds.org/messier/open.html
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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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Star clusters are groups of physically similar stars bound to one another by gravitational attraction. Clusters are thought to originate from large cosmic gas and dust clouds. Most star clusters have short lives as stellar swarms. As they d...
http://www.farmersalmanac.com/astronomy/a/what-are-star...
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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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Open Clusters ... Globular Clusters ... Star Clusters fall in two categories: Open Clusters and Globular Clusters.
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astrim.free.fr/aboutcluster.htm
astrim.free.fr/aboutcluster.htm
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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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