Name the structure that is composed of hundreds to thousands of galaxies and has an average mass of 10^14-10^15 suns.

A galaxy cluster is a structure composed of hundreds to thousands of galaxies that are gravitationally linked together. They are among the biggest known gravitationally-bound formations in the cosmos and were thought to be the largest until the superclusters were found in the 1980s.

Asked by Vasilii Kulev · Last updated 4 years ago · 3.1K views · SOURCE