Physics – 6.2.1 The Sun as a star | e-Consult
6.2.1 The Sun as a star (1 questions)
Stars are in a state of equilibrium because they exist in a dynamic balance between two opposing forces: gravity and the outward pressure generated by nuclear fusion.
Gravity acts inwards, attempting to collapse the star under its own weight. This force is proportional to the mass of the star – the more massive the star, the stronger the gravitational pull.
Nuclear fusion, occurring in the star's core, generates a tremendous amount of energy. This energy is released as heat and light, creating an outward pressure that counteracts gravity. This outward pressure is proportional to the temperature and density of the core.
The nuclear fusion process is crucial for maintaining this equilibrium. The energy released by fusion provides the necessary pressure to resist the inward pull of gravity. If fusion were to stop, gravity would cause the star to collapse. Therefore, the ongoing nuclear fusion is essential for the star's stability and long-term existence.