10: The Sun Last updated Save as PDF Page ID 64060 Lumen Learning Lumen Learning 10.1: Module Introduction 10.2: What do you think? 10.3: Fission and Fusion 10.4: Our Star, the Sun 10.5: How the Sun Works 10.6: A “Quick Guide” to Solar Fusion—The Proton-Proton Cycle 10.7: Solar Regions 10.8: Major Solar Features 10.9: Studying the Sun 10.10: The Dark Side of the Sun 10.11: The National Solar Observatory 10.12: NASA’s Heliophysics Science Division