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. Open clusters become disrupted over time by the gravitational influence of giant molecular clouds as they move through the galaxy, but cluster members will continue to move in broadly the same direction through space even though they are no longer gravitationally bound; they are then known as a stellar association, sometimes also referred to as a moving group.
Cosmology :: Astronomy
Stars :: Astronomy

Star Clusters - General information on star clusters from SEDS.
Lacaille's Catalog of Nebulae of the Southern Sky - A discussion of Lacaille's catalog, which is mainly of historical interest. Includes the catalog itself.
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Stellar Clusters - Lecture notes by Professor Barbara Ryden.
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