noun🔗ShareProtoplanetasAn 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"Scientists believe that protoplanets, formed from smaller space rocks, eventually crashed together to create the planets in our solar system. "Los científicos creen que los protoplanetas, formados a partir de rocas espaciales más pequeñas, finalmente chocaron entre sí para crear los planetas de nuestro sistema solar.astronomyspacescienceChat with AIVocabulary GamePractice Reading