noun🔗SharePlanetesimalesAny of many small, solid astronomical objects that orbit a star and form protoplanets through mutual gravitational attraction."In the early solar system, dust and gas gradually clumped together, forming planetesimals, which then collided and merged to create the planets we know today. "En el sistema solar primitivo, el polvo y el gas se agruparon gradualmente, formando planetesimales, que luego colisionaron y se fusionaron para crear los planetas que conocemos hoy.astronomyspacescienceChat with AIVocabulary GamePractice Reading