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A general term for a group of related stars. There are two basic types of star cluster:
Open and Globular. Open Clusters represent stellar 'siblings': stars
born in the same stellar nursery that develop together. Globular Clusters tend to be
larger, and are normally found in intergalactic space, outside the disc of the Milky Way.
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In young Open Clusters like this one, it is common to find remnants of the nebular material from which the cluster's stars were born.
A typical Globular Cluster. About 250 of these huge spherical clusters swarm around the
Milky Way galaxy.
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