Pisces–Cetus Supercluster Complex


The Pisces–Cetus Supercluster Complex is a galaxy filament. It includes the Virgo Supercluster which in turn contains the Local Group, the galaxy cluster that includes the Milky Way.
This filament is adjacent to the Perseus–Pegasus Filament.
However, a 2014 study indicates that the Virgo Supercluster is only a lobe of a greater supercluster, Laniakea.

Discovery

of the University of Hawaii’s Institute of Astronomy identified the Complex in 1987.

Extent

The Pisces–Cetus Supercluster Complex is estimated to be about 1.0 billion light-years long and 150 million light years wide. It is one of the largest structures known in the observable universe, but is exceeded by the Sloan Great Wall, Clowes–Campusano LQG, U1.11 LQG, Huge-LQG, and Hercules–Corona Borealis Great Wall, respectively.
The complex comprises about 60 clusters and is estimated to have a total mass of 10. According to the discoverer, the complex is composed of 5 parts:
  1. The Pisces-Cetus Supercluster
  2. The Perseus-Pegasus chain, including the Perseus-Pisces Supercluster
  3. The Pegasus-Pisces chain
  4. The Sculptor region, including the Sculptor Supercluster and Hercules Supercluster
  5. The Laniakea Supercluster, which contains our Virgo Supercluster as well as the Hydra-Centaurus Supercluster.
With its mass of 10, our Virgo Supercluster accounts only for 0.1 percent of the total mass of the complex.
The complex was named after the Pisces-Cetus Superclusters, which are its richest superclusters.

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