What are the clusters of galaxies | Earth, Solar System and Universe.

Galaxy clusters are gigantic structures of the universe. Galaxies emit a lot of gravity. This makes the nearby galaxies to attract each other and be grouped together forming clusters. Our Galaxy, the milky way, is part of a small Local Group called cluster.
Within a cluster, galaxies rotate each winch to others, and even often they collide. The size and mass of a cluster galaxies forming it will vary, but the distance between one end and the other is always several million years light.
Clusters are not composed only of galaxies, but also of great clouds of hot gas. In general, they are remains of galaxies that die to the clash. But most of the mass of the cluster's 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 core hosts most of the hot gas, and emits a large amount of x-ray. The most dense galaxies are close to the Centre, where the gravity is greater. Thousands of clouds of gas between galaxies are scattered around.

What are Superclusters of galaxies

The Superclusters of galaxies are the second largest structure in the universe. Huge walls of Superclusters outweigh them. They are groupings of galaxy clusters, and are found throughout the known universe.
Galaxy clusters are joined by their ends, and form huge chains. The Superclusters gravity is so great that even slows the expansion of the universe. All matter is attracted, and that creates huge gaps between some Superclusters and others.
Our Local Group is part of the Virgo supercluster, which, in turn, is integrated into a superstructure called Laniakea ("sky immense", in Hawaiian).
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