Dynamical mass is a concept in physics and astronomy that refers to the measurement of an object's mass based on its motion and gravitational interactions with other objects. These measurements are typically made using observational data such as the orbits of stars or galaxies, rather than direct measurements of the object's mass. Dynamical mass measurements are important in a variety of scientific fields, including astrophysics, cosmology, and particle physics. By accurately determining an object's mass through its dynamics, researchers can gain insights into the structure, composition, and evolution of galaxies, galaxy clusters, and other cosmic objects. Overall, dynamical mass is a crucial tool for understanding the behaviors and properties of objects in the universe, and plays a significant role in advancing our knowledge of the cosmos.