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Galaxy Filaments are the largest known structures in the universe, which consist of long curved lines of galaxies, which clump together into galaxy clusters and superclusters where several filaments cross.

See List of galaxy superclusters https://en.wikipedia.org/wiki/List_of_galaxy_superclusters, List of galaxy clusters https://en.wikipedia.org/wiki/List_of_galaxy_clusters, or List of galaxies https://en.wikipedia.org/wiki/List_of_galaxies.

Supercluster