This page explains the lifecycle of low-mass stars, such as the Sun, starting with hydrogen fusion via the proton-proton cycle. After hydrogen depletion, the star expands into a Subgiant and then a Re...This page explains the lifecycle of low-mass stars, such as the Sun, starting with hydrogen fusion via the proton-proton cycle. After hydrogen depletion, the star expands into a Subgiant and then a Red Giant, where outer layers expand and the core compresses, leading to Hydrogen Shell Burning. Eventually, helium fusion produces carbon, causing the star to dim and contract. This fusion cycle continues for millions of years until the core mainly comprises carbon.
