True. Helium gradually replaces hydrogen in the core region. Later in a star's life, even heavier elements are made when the helium undergoes further fusion reactions.
True. As a star ages, its internal composition changes as a result of nuclear reactions taking place in its core. These reactions involve the conversion of lighter elements, such as hydrogen and helium, into heavier elements through processes like fusion. This process is responsible for the synthesis of elements within stars and is a fundamental aspect of stellar evolution.
True. As a star ages, its internal composition does change due to nuclear reactions taking place in its core. These nuclear reactions, specifically nuclear fusion, convert lighter elements into heavier ones, releasing a tremendous amount of energy in the process. The primary fusion reaction that powers most stars is the conversion of hydrogen into helium through a series of steps known as the proton-proton chain or the CNO cycle, depending on the star's temperature. These reactions create a continuous balance between the inward gravitational force and the outward pressure generated by the release of energy, thus allowing the star to maintain its stability and shine brightly.
