Galactic Dynamics is the study of the motion and gravitational interactions of stars, gas, and dark matter within galaxies. It helps astronomers understand how galaxies form, evolve, and interact with one another over time. By analyzing the orbits of stars and the distribution of mass, researchers can infer the underlying gravitational forces at play. This field also explores phenomena such as spiral arms, galactic mergers, and the role of dark matter in shaping the structure of galaxies. Understanding these dynamics is crucial for piecing together the history of the universe and the formation of cosmic structures.