After two decades in space, NASA's Cassini spacecraft has ended its remarkable journey of exploration. In this activity, split into three 30-40 minute sessions, students will: Experience the vastness of the solar system and the size differences among the Sun, our home planet Earth, and this unit’s theme — Saturn. Walk a playground or other large area to create a scale model for size and distance in our solar system. A variation for an indoor model is included. Participate in the creation of an