One of my favorite activities when teaching astronomy is the “Solar System Walkabout”. In this activity we first compare the sun to a bowling ball and then go through each of the planets and show its size at this scale. Once sizes are established, we then try to recreate the correct distance between planets. The students soon realize that the classroom is way too small for us to accomplish our goals so we take it out outside and do a little fieldtrip or “walkabout” to capture the real scale of t