Red Giant Star Structure Diagram - Core, Shells, and Envelope Layers #3699095 (License: Personal Use)

This diagram depicts the internal structure of a red giant star during late-stage evolution, featuring an inert carbon-oxygen (C-O) core surrounded by concentric shells where helium and hydrogen fusion occur. Beyond the burning shells lie the radiative layer and the outer convective hydrogen envelope, which expands dramatically as the star evolves off the main sequence. The color-coded layers highlight physical processes driving stellar expansion and luminosity increase.

Used in astronomy education, astrophysics articles, or stellar evolution resources to visually explain how low- to intermediate-mass stars evolve into red giants after exhausting core hydrogen. Matches user intent for learning about stellar life cycles and internal structure.