What is the diameter of this mass concentration of galaxies that contains the Local Sheet?
Virgo Supercluster: The Virgo Supercluster (Virgo SC) or the Local Supercluster (LSC or LS) is a mass concentration of galaxies that contains the Virgo Cluster in addition to the Local Group, which in turn contains the Milky Way and Andromeda galaxies. Virgo Supercluster:  At least 100 galaxy groups and clusters are located within its diameter of 33 megaparsecs (110 million light-years).
i don't know