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.
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A loose association of stars in the galactic disc of the
Milky Way . The stars will have formed from the same dense core and will now be moving apart as they orbit the galactic centre. Examples of these star clusters are the Seven Sisters cluster and the Hyades cluster.
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