This image from the NASA Hubble Space Telescope demonstrates a true mix of different galaxies. Some belong to a large structure: in the middle of the frame is a galactic cluster of SDSS J1050 + 0017.
The giant mass of this cluster creates an amazing phenomenon of powerful gravitational lensing. Cluster gravity bends light, allowing you to see how curved bands form a circular shape around the center of the frame. Scientists can use distorted galaxies to calculate the massiveness of a cluster, including the mass of dark matter inside it. This allows you to look deeper into the universe. Gravitational lensing not only distorts galactic species, but also increases their appearance and light. Hubble studied the events of gravitational lensing many times and showed amazing images. Astronomers have even created a special program for studying various galactic clusters - The Frontier Fields (Last Frontiers). Thus, we managed to find some of the most distant universe galaxies.