Some ideas
I started with the earth, since students are probably more familiar with then. Then I taught the moon, then the sun. Here are the activities we did:
- After learning characteristics of the layers of the earth, students had to write a story as if they were traveling to the center of the earth. They had to describe what they saw in each layer, and they also illustrated it.
- For the sun, we made a model and labeled the corona, etc.
- We studied the phases of the moon, and I had them complete a worksheet to label the phases. (dull, I know, but I was out of ideas) Before doing the labels, I did a demonstration with a beach ball and a flashlight.