Ryugu is a research area related to the study of the Ryugu asteroid, a near-Earth object that was visited by the Japanese spacecraft Hayabusa2 in 2018. Researchers are interested in studying the composition, structure, and origins of Ryugu in order to gain insights into the early formation and evolution of the solar system. This research area involves a combination of remote sensing observations, data analysis, and laboratory experiments to understand the asteroid's physical and chemical properties.