ThePisces–Cetus Supercluster Complex is agalaxy filament. It includes theLaniakea Supercluster which contains theVirgo Supercluster lobe which in turn contains theLocal Group, thegalaxy cluster that includes theMilky Way.^[1]This filament is adjacent to thePerseus–Pegasus Filament.^[2] AstronomerR. Brent Tully of theUniversity of Hawaii's Institute of Astronomy identified the Complex in 1987.^[3]

The Pisces–Cetus Supercluster Complex is estimated to be about 1.0 billionlight-years (Gly) long and 150 million light years (Mly) wide. It is one of thelargest structures known in theobservable universe, but is exceeded by theSloan Great Wall (1.3 Gly),Clowes–Campusano LQG (2.0 Gly),U1.11 LQG (2.5 Gly),Huge-LQG (4.0 Gly), andHercules–Corona Borealis Great Wall (10 Gly), respectively.

Sixty clusters comprise the complex, which is estimated to have a total mass of 10¹⁸M_☉.^[4] According to the discoverer, the complex is composed of 5 parts:

1. The Pisces–Cetus Supercluster
2. The Perseus–Pegasus chain, including thePerseus–Pisces Supercluster
3. The Pegasus–Pisces chain
4. The Sculptor region, including theSculptor Supercluster andHercules Supercluster
5. TheLaniakea Supercluster, which contains ourVirgo Supercluster (Local Supercluster) as well as theHydra–Centaurus Supercluster.^[4]

With its mass of 10¹⁵M_☉, ourVirgo 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.

• Pisces–Cetus Supercluster Complex
• Astronomical objects discovered in 1987
• Galaxy filaments

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• Short description is different from Wikidata