Planetary geology is the study of the geology of planets, moons, asteroids, and other celestial bodies in our solar system and beyond. Researchers in this field study the formation, structure, composition, and processes of these bodies, as well as their geological history and evolution. By examining the surface features, mineralogy, and geological formations of these bodies, planetary geologists can gain insights into their past and present conditions, as well as the potential for life or resources on them. This area of research is primarily conducted through remote sensing from spacecraft, as well as the analysis of samples collected from missions to these celestial bodies.