Planetary interior research focuses on studying the composition, structure, and dynamics of the interior of planets, including Earth and other celestial bodies such as Mars, Venus, and Mercury. Scientists use various methods such as seismology, geomagnetism, gravity measurements, and computer modeling to investigate the internal properties of planets, including their core, mantle, and crust. Understanding the planetary interior is crucial for deciphering the formation, evolution, and geological processes of planets, as well as predicting their future behavior. This research area also helps us understand the potential for habitability and the presence of resources on other planets.