Globular and Open Star Clusters

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