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List of Globular Clusters - Wikipedia, the Free Encyclopedia
This is a list of globular clusters. The apparent magnitude does not include an extinction correction.
https://en.wikipedia.org/wiki/List_of_globular_clusters
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Open Star Clusters: Information and Observations - NightSkyInfo
Provides an introduction to open star clusters, observations and pictures of open star clusters.
http://www.nightskyinfo.com/open_clusters/
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Star Cluster - Universe Today
There are few things in astronomy more awe inspiring and spellbinding than the birth of a star. Learn about star clusters here.
http://www.universetoday.com/78112/star-cluster/
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Star Cluster Facts, Information, Pictures - Encyclopedia
Star cluster a group of stars near each other in space and resembling each other in certain characteristics that suggest a common origin.
http://www.encyclopedia.com/topic/star_cluster.aspx
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Star Clusters - Celestial Onjects on Sea and Sky
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.
http://www.seasky.org/celestial-objects/star-clusters.html
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Star Clusters - Science Daily
Star clusters are groups of stars which are gravitationally bound. Two distinct types of star cluster can be distinguished: globular clusters are tight groups of hundreds of thousands of very old stars, while open clusters generally contain less than a few hundred members, and are often very young.
https://www.sciencedaily.com/terms/star_cluster.htm
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Picture Album: Star Clusters - Hubblesite
Star cluster pictures from the Hubble space craft.
http://hubblesite.org/gallery/album/star/star_cluster
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Star Clusters - Australia Telescope National Facility
Star Clusters section of astrophysics option for NSW HSC Physics course.
http://www.atnf.csiro.au/outreach/education/senior/astrophysics/stellarevolution_clusters.html
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Star Cluster, Astronomy - Britannica
Either of two general types of stellar assemblages held together by the mutual gravitational attraction of its members, which are physically related through common origin.
http://www.britannica.com/topic/star-cluster
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Star Cluster - Wikipedia, the Free Encyclopedia
Star clusters or star clouds are groups of stars. Two types of star clusters can be distinguished: globular clusters are tight groups of hundreds or thousands of very old stars which are gravitationally bound, while open clusters, more loosely clustered groups of stars, generally contain fewer than a few hundred members, and are often very young.
https://en.wikipedia.org/wiki/Star_cluster
