Pisces–Cetus Supercluster Complex

The Pisces–Cetus Supercluster Complex is a vast, filamentary arrangement of galaxy superclusters and groups spanning a large region of the observable universe.

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Galaxy group: A small gravitationally bound association of galaxies. Groups are among the smaller structures gathered into the complex.
Large-scale structure of the universe: The organization of matter in the universe on scales much larger than individual galaxies. The complex is a prominent regional pattern in this broader structure.
Perseus–Pisces Supercluster: A long chain of galaxy clusters and groups in the direction of the constellations Perseus and Pisces. It is a major named structure associated with the complex’s region.
Observable universe: The region of the universe from which light has had time to reach Earth since the early universe. The complex is a small part of this larger observable domain.
Galaxy cluster: A gravitationally bound system containing hundreds to thousands of galaxies, hot gas, and dark matter. Clusters are major dense components within its large-scale arrangement.
Gravitational instability: The growth of initially small density differences as gravity draws matter toward denser regions. This process amplifies the density contrasts that shape superclusters and filaments.
Pisces–Cetus Supercluster: A large concentration of galaxy clusters and groups in the Pisces–Cetus region. Its name is closely associated with the broader complex, though usage and boundaries vary.
Hubble flow: The average recession of distant galaxies caused by the expansion of the universe. Expansion affects distance estimates and whether distant components can be physically associated.
Galaxy filament: An elongated concentration of galaxies and dark matter connecting denser regions of the cosmic web. Filamentary connections give the complex its large-scale shape.
ΛCDM model: The standard cosmological model combining a cosmological constant with cold dark matter. It describes the expansion and matter content underlying the complex’s formation.