The M21 open cluster has a strong concentration of stars at its centre and is thought to be about 4.6 million years old.

At 10,400 light years, M22 is one of our nearer globular clusters and is thought to contain about 70,000 stars. The Hubble telescope has discovered a considerable number of planet-sized objects that appear to float through the cluster.

The M2 contains at least 150 stars and, at up to 300 million years old, is thought to be one of the oldest open star clusters.

The M24 Milky Way Patch is a pseudo cluster of stars spread across thousands of light years. Actually a huge star cloud within the Milky Way, M24 is part of a spiral arm within the galaxy in Sagittarius at 4.6 magnitude.

Our view towards the centre of the galaxy, in the direction of Sagittarius, is obscured by extensive clouds of interstellar dust. The large-scale, patchy nature of the obscuration can be seen with the unaided eye. M24 is a tunnel through the dust by which we can see through to, otherwise, hidden distant regions.

The M25 open cluster in Sagittarius at 4.6 magnitude has up to 600 stars.