This lesson plan is part of the lesson plan library for grades 9-12. It focuses on nuclear reactions, specifically fusion which creates energy on the Sun. Other types of reactions are radioactive decay and fission. Students look at these different types of reactions and learn about how they happen, and specifics about the Sun such as solar flares, neutrinos, and solar energy. It includes objectives, materials, procedures, discussion questions, evaluation ideas, performing extensions, suggested readings, and vocabulary. There are videos available to order which complement this lesson, an audio-enhanced vocabulary list, and links to teaching tools for making custom quizzes, worksheets, puzzles and lesson plans.