NGC 6809 globular star culster

Messier 55 - The NGC 6809 Globular Star Cluster

Messier 55 - The NGC 6809 Globular Star Cluster

In the 18th century, while searching the night sky for comets, French astronomer Charles Messier kept noting the presence of fixed, diffuse objects in the night sky. In time, he would come to compile a list of approximately 100 of these objects, with the purpose of making sure that astronomers did not mistake them for comets. However, this list – known as the Messier Catalog – would go on to serve a more important function.