As children develop an understanding of their place in the universe, their mental model of the solar system should really go beyond a list of planet names and attributes to become a dynamic concept of bodies in motion and interaction. Montessori educators can help build a Sensorial impression of the cosmos by physically modeling the nature of gravity as it drives celestial systems, by modeling the interactions of small bodies in space, much as the land and water forms show properties of landforms that give children tools to understand maps of the world. Modeling the forces that shape the solar system captures children's imaginations, as does searching for and holding in their hands a real connection between outer space and the world beneath their feet. The sequence of activities presented in this article makes the study of the solar system's small bodies a more tactile experience. It presents planetary science as something dynamic within a 3-6 environment, with ready extension into an Elementary classroom: many worlds in motion and interaction, with gravity as a force that aggregates small bodies together into larger ones.