What happened when temperature of suns core is high enough?

When the temperature of the Sun's core reaches sufficiently high levels, nuclear fusion occurs, primarily converting hydrogen into helium. This process releases vast amounts of energy in the form of light and heat, which sustains the Sun's luminosity and provides the energy that supports life on Earth. If the core temperature were to increase further, it could lead to the fusion of heavier elements, triggering different stages in stellar evolution. However, the current balance of pressure and gravity maintains stability in the Sun's core, preventing catastrophic changes.