We strung our planets together with floral wire and hooked all the ends together to make a mobile. Rocket ships were added. Kids quickly used what they learned to create 3-D fins for their rockets by notching and sliding the pieces together.
It was difficult to get good photos of this project because they didn't hang around long. Kids took them home the same day.
Se7en. Complete direction on how the planets are put together can be found there.