Greyhound 1

Greyhound 1 (NGC 7841, Messier 111) is a open cluster in Camelopardalis. It hosts some of the most massive, if not the largest stars in the Milky Way.

Star Population
Greyhound 1 is filled with extremely massive O-Type stars. All of them are more massive than 8-16 solar masses. Some of them are evolving into Red Hypergiants, which will evolve into Red Metagiants. It is also a relatively new cluster, The cluster is only 3 million years old. It is home to at least over 100-200 stars.

Mass Segregation
The least massive star in Greyhound 1 is around 8-16 solar masses. While the largest is around >150 solar masses. Most of them are concentrated around 20-40 solar masses. The average is 25 solar masses.

Future
In the future, extremely massive O-Type stars will turn into black holes. Which will form separate Hypercompact stellar systems, Overtime, These hypercompact stellar system will be divided to far distances, some will be ejected to form their own galaxies.