A comprehensive fifteen-lesson unit plan on Stars and Planets. Specifically aligned with the British Columbian Curriculum (Canada), but can easily be modified to any primary space science curriculum.
Notable features are: assessment plans, assessment chart, unit-at-a-glance timeline, lesson timeline, lesson plan examples, and differentiation suggestions. Copyrighted materials are removed but e-mail me if you are interested in where I sourced them.
I had to create this for a university course, so there is some reflective writing, but it may be of use so I left it in!