Star cluster

Globular Cluster, catch taken with SpaceEngine.

Star Clusters are astronomical objects, they are composed of many stars.

There are two types of clusters: Globular Clusters and Open Clusters.

Globular Clusters are groups of old stars, they have between  100,000 and 1 million stars and are denser than open clusters.

In the Milky Way globular clusters are located in the galactic Halo.

Open Clusters are groups of young stars, they have a few thousand stars, these stars were formed from the same giant molecular cloud, and are united by their mutual gravity.

In the Milky Way open clusters are located in the galactic disk.