1) The document describes an activity to model the phases of the moon using a polystyrene ball, pencil, and lamp. Students will move the "moon" around the stationary "sun" to see how the illuminated portion changes from new moon to full moon and back again over a 28 day cycle. 2) Key phases described are new moon, waxing crescent, first quarter, full moon, waning crescent, and back to new moon. As the moon orbits the Earth, different portions are illuminated by the sun. 3) Fun facts about the moon include that it takes about 29.5 days to orbit Earth, crescent means less than a quarter illuminated while gibbous is more,