supercluster of galaxies
Astronomical term for a large-scale structure composed of multiple galaxy clusters.
The Virgo Supercluster is a vast structure that includes our Milky Way galaxy.
銀河団 is a galaxy cluster, a smaller grouping of galaxies; 超銀河集団 is a supercluster, a larger structure containing multiple galaxy clusters.
Compound of 超 (super-), 銀河 (galaxy), and 集団 (group, cluster). A straightforward calque of the English term 'supercluster of galaxies'.