Galaxy Cluster

• Confined to the galactic disk, galactic clusters, also known as open clusters, have an open appearance where individual stars can be observed.
• Examples include the Pleiades.
• Typically, galactic clusters contain fewer than 1,000 stars and have a diameter of less than approximately 10 parsecs.
• Recent near-infrared surveys have revealed more cluster members than previously known, and these clusters may be associated with interstellar gas and dust.