CK-12 Foundation
Ck 12: Earth Science: Star Power Study Guide
[Free Registration/Login may be required to access all resource tools.] This study guide summarizes key points about the energy in stars. Includes a few questions to check for understanding.
PBS
Pbs Learning Media: Birth of a Supernova, Type Ii
In this interactive activity from NOVA Online, learn about a type of exploding star a Type II supernova that is so large it has a mass 10 times greater than the mass of our Sun.