Astronomers have found that galaxies separated by large distances appear to be linked with neighbouring galaxies, perhaps the result of a large-scale structure of the universe
Source:
https://www.newscientist.com/article/2220797-distant-galaxies-moving-in-sync-hint-at-cosmic-web-across-the-universe/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home