Planetary astronomy is a branch of astronomy that focuses on the study of planets, moons, and other celestial bodies within our solar system and beyond. Researchers in this field study the physical and chemical characteristics of planets, their atmospheres, surfaces, rotations, and movements. They also investigate the formation and evolution of planets, as well as the interactions between planets and other objects in the solar system. Planetary astronomers use telescopes, space probes, and other instruments to gather data and analyze the properties and behavior of planets in order to better understand their origins and dynamics.