Hodge, Paul Department of Astronomy, University of Washington, Seattle, Washington.
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Large groupings of stars with dimensions of 1000 to several thousand light-years. Star clouds are not stable clusterings of stars or even groups of a common origin, such as stellar associations. Instead, they are large areas where the stellar density is higher than average in a galaxy. They are nevertheless physical entities in that they result from large-scale star formation events or series of events that are to some extent limited in size by the characteristics of the galactic environment.
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