Describing the life cycle of stars. Begin with a brief overview of the nature and importance of light and other electromagnetic waves. Then explain where stars fit in the hierarchy of the universe, the characteristics of stars, and processes by which stars form, live, and die. Discuss how the materials are recycled and how this process might be related to the structure of the MilkyWay Galaxy and to the origin of the universe.

Consider these facts in describing the life cycle of stars:

Stars seem unchanging, but they are not. Stars are born from the interstellar medium, become main sequence stars, use up sources of energy, and then ultimately die. During this time, the star can change dramatically. Then its ultimate fate depends on its mass.