GLOBULAR CLUSTERS.
Globular Clusters are symmetrical systems of up to a million stars formed about 13 to 15 billion years ago, and as such they are the oldest surviving stellar subsystems in galaxies. As of 1993, there were about 125 of these known in our own galaxy, most of them in a spherical halo surrounding the wheel-like shape formed by the spriral arms.
A typical globular cluster is a nearly symmetrical system of stars, with the highest concentration of stars near its own center. In these central regions of the cluster, the stars are so closely packed that often it becomes difficult to distinguish individual points of light from each other.
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