Structures of galaxies Clusters

In the universe Galaxy clusters are huge structures. Galaxies emit a lot of gravity. These causes nearby galaxies attract each other and are merged to form clusters. Our galaxy, the Milky Way, is part of a small cluster called the Local Group . Within a cluster, galaxies rotate around each other, and even frequently collide. The size and mass of the cluster galaxies varies with the form, but the distance between one end and another is always several million light years.

 The clusters are composed not only of galaxies but also of large clouds of hot gas. In general, galaxies are remnants of die clash. But most of the cluster mass is dark matter. It is believed that each cluster can have up to five times more dark matter than visible matter. Clusters are spherical or spiral, and revolve around a central core. The nucleus receives most of the hot gas, and emits a large amount of X-ray The galaxies are denser near the center, where gravity is higher. Around thousands of galaxies spread clouds of gas.