Visually see the distance and size of objects in the solar system.
When you go on NASA'a site, search for: JPL 400-1003 and you will get the pdf activity.
You need a large field to do this activity.
Text of Learning Exercise:
Have the students bring in an old baseball cap and give them a planet. They color the hat in the color of their planet and they make a scaled model of their planet and place it on the rim. When they go to their spot in the solar system, have them point the rim of their hat in the direction of the orbit. This allows you to bring in vectors and motion to the activity.