How is this possible? Well clearly at the beginning of the solar system, Mars and the Earth were bombarded by giant asteroids and comets, and there were ejecta from these impacts all over the place.
¿Cómo es esto posible? Bueno, obviamente, en los inicios del sistema solar, Marte y la Tierra fueron bombardeados por grandes cometas y asteroides, y hubo miles de partículas esparcidas por todas partes.