Galaxy masses refer to the total mass of a galaxy, which includes all the stars, gas, dust, and dark matter it contains. Measuring the mass of a galaxy is crucial for understanding its evolution, structure, and dynamics. Researchers use various methods, such as gravitational lensing, velocity measurements, and dynamical modeling, to estimate the mass of galaxies. Studying galaxy masses helps scientists investigate the formation and growth of galaxies, as well as their interactions with other galaxies and the large-scale structure of the universe.