William Herschel began a survey program in 1782 using larger telescopes and was able to resolve the stars in all 33 of the known globular clusters.

The 12 cases of infection were confirmed to be the first known cluster of local transmission of the virus.

Cutaneous mucormycosis has been reported after previous natural disasters; however, this is the first known cluster occurring after a tornado.

M13 is one of nearly 150 known globular clusters surrounding our Milky Way galaxy.

When age, spatial distribution, and kinematics are taken into account simultaneously, a significant number of known young open clusters are found in groups.

M19 is one of the most oblate of the known globular clusters.

Phoenix Cluster is also producing more X-rays than any other known massive cluster.

Thus, it is a cluster of stars like no known cluster of stars in our galaxy.

At an estimated 12.0 billion years old, it is one of the oldest known globular clusters.

The Bullet Cluster is one of the hottest known clusters of galaxies.