Explain that stars can be different some are smaller, some are larger, and some appear brighter than others all except the sun are so far away that they look like points of light. Fun Ways to Learn About the Moon and Stars (from Fantastic Fun & Learning)
Science for Kids: a wide range of fun science lesson plans featuring educational activities for kids, ideas for teachers, free online resources and more to help bring interactive, hands on science to your home or classroom.
Science Anchor Chart -Solar System: Rotating and Revolving Teaching Special Thinkers. I would use this to teach the difference between the planets rotating and revolving. After this, I could work my way into the stars and different constellations.