noun🔗Share원시 행성An astronomical object, approximately the size of the Moon, formed from the mutual gravitational attraction of planetesimals; they are thought to collide with each other and slowly form planets"The astronomers believe a protoplanet, about the size of our Moon, collided with another one billions of years ago, eventually forming the planet Earth. "천문학자들은 달 크기 정도의 원시 행성이 수십억 년 전에 다른 행성과 충돌하여 결국 지구를 형성했다고 믿습니다.astronomyspacescienceChat with AIVocabulary GamePractice Reading
