To Expand and Test you knowledge visit the following links:
Try the Interactive Lab to expand your knowledge. This link shows how the stars surface temperature and luminosity (star's brightness) change as a star goes through its life cycle.The HR Diagram Fun is a link that tests your knowledge.
Think your done exploring? Well, check out the link below for some fun games as a reward for your hard work!
http://www.seasky.org/space-games.html