The space can boast of really large-scale formations. But scientists still do not know the details of the process of their creation. The main theory is based on hierarchical clustering, where smaller clots of matter merge to increase volume. For 14 billion years of existence of the Universe, it was possible to create incredibly huge structures.
Before you is the cluster Abell 665, which entered George Abel's catalog in 1958. Located in the territory of the Great Bear. For the review, a large-scale camera 3 with visible and IR light was used.
This is the only cluster in the catalog that received class 5. That is, at least 300 galaxies are located here. Therefore, the object is valuable for scientific research. It was possible to find out that there is a huge radio hiding here, whose powerful shock waves were used to calculate the updated Hubble constant.