This powerpoint presentation includes a short explanation of stars, a short video on light years, and then focuses on constellations at the end. It's meant to be an introduction to stars and constellations. After this presentation you can follow up with constellation activities such as tracing constellations, finding constellations, and learning the myths behind constellations.
For other solar system presentations, check them out on my site.
Rotation and Revolution of the Earth
Moon Phases and Facts
The Planets of the Solar System