This lesson plan is part of the DiscoverySchool.com lesson plan library for grades 9-12. It addresses the question of how astronomers know the evolution of a star without being able to see it happen. Students look at the different stages in the lives of stars, from protostars to red giants and black holes. The lesson includes objectives, materials, procedures, discussion questions, evaluation ideas, performing extensions, suggested readings, and vocabulary. There are videos available to order which complement this lesson, audio vocabulary, and links to teaching tools for making custom quizzes, worksheets, puzzles and lesson plans.