The m13 is a cluster of more than 500 stars in our galaxy known as the Hercules Cluster. It is located approximately 25,000 light-years away from Earth in the constellation of Hercules. This cluster is visible in the evening sky, meaning it is one of the brighter and more easily visible clusters in our night sky.

History of the Hercules Cluster

One of the most ancient known star clusters, the Hercules Cluster was first charted by early astronomers as Hipparchus in 130 B.C. and later by Ptolemy in his Almagest atlas.

Characteristics of the Hercules Cluster

The Hercules Cluster is one of the brightest and most prominent star clusters in the Milky Way galaxy. It is a globular type of cluster, known as a “globular cluster”, meaning that it is a group of thousands of stars bunched together into a round or oval shaped cluster.

One of the main characteristics of this cluster is its sheer size; it is estimated to contain more than 500 stars with a diameter of 100 light-years.

Significance of the Hercules Cluster

The cluster is of great significance to astronomers. It has served to help them learn and understand more about the behavior of stars, star clusters, and the forces behind their formation.

In particular, the Hercules Cluster is known for allowing astronomers to study the long-term changes in stars over time. By mapping the stars in the Hercules Cluster, astronomers determine their age and mass, as well as their distance from the Earth. This has, in turn, led to greater knowledge about our galaxy.


The Hercules Cluster, also known as the m13, is one of the most prominent star clusters in the Milky Way galaxy. Not only is it a spectacular sight in the night sky, it is also of great scientific significance, helping astronomers learn more about the forces behind star formation and the behavior of stars over time.

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