... To construct a scale model of Saturn and its rings . ... Students will construct a scale model of Saturn; use it to explain a Voyager image of Saturn's shadow on its rings; and, by trial and error, discover that light moves through space in straight lines. ... If the students correctly identify the ring's shadow on the planet and the planet's shadow on the rings, label these as well. ... ii) As they raise or lower the flashlight relative to the grapefruit, the shadow of Saturn on its rings changes. ...