A supercluster.
A so-called "great wall", which is a block of galaxies more than a billion light-years long.
galaxies are in every direction in space there in clusters and super clusters
galaxies
yes
Stars, star clusters, distant galaxies, galaxy clusters, nebulae, ...
The galaxy clusters are the solar systems orbiting the galaxies.
galaxies
Galaxy clusters typically have anywhere from 50 to 1,000 galaxies.
They are simply called "galaxies which are part of a cluster".
Clusters of galaxies form due to the gravitational attraction between individual galaxies in a region of space. Over time, these galaxies are pulled together by their mutual gravity to create a cluster structure. The largest clusters are held together by dark matter, which provides the majority of the mass in the system.
Galaxies that travel together through space are called galaxy groups or galaxy clusters. These are systems of galaxies bound together by gravity.
Most galaxies, even our own, are found in groups or clusters. For example, the Local Group contains several galaxies including the Milky Way, Andromeda, and the Magellanic clouds.