This amazing Hubble Space Telescope image displays a massive galactic cluster, PSZ2 G138.61-10.84, distant by about 6 billion light-years from us. Galaxies are not randomly distributed in space. More specifically, they are grouped as clusters and superclusters. The latter extend hundreds of millions of light years and contain billions of galaxies.
For example, the Milky Way is a part of the Local Group, which is also part of the Laniakey supercluster. It was Hubble that allowed scientists to study massive galactic constructions like the Great Wall of Hercules-Northern Crown - a giant galactic cluster, having a billion galaxies and stretching 10 billion light years. This is the largest known structure in the studied universe. For the picture, an improved camera and a Hubble wide-angle camera 3 were used. Comes into the part of the program RELICS, which has already managed to display 41 massive clusters during the search for the brightest distant galaxies.