Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
천체지질학은 행성과 위성의 지질을 연구하는 학문입니다.cheontaejijilhak-eun haengseong-gwa wiseong-ui jijil-eul yeongu-haneun hakmun-imnida.Astrogeology is the study of the geology of planets and moons.