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AstroImaging by Kent Biggs
"Time - its what keeps everything from happening at once" -unknown
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Globular clusters are relatively dense collections of stars from a few tens of thousands to millions of star members. Globular clusters spherically symmetric in appearance and are usually found on the outside of galaxies often forming a halo around their parent galaxy. Open Clusters are less dense collection of stars and asymmetric in appearance. They are found anywhere in the galaxy and can contain from a few dozen to thousands of stars.
Globular Cluster M15
M13 - Reimaged!
M13 - Hercules Cluster