What does the sun s energy come from?

The sun's energy comes from the process of nuclear fusion occurring in its core, where hydrogen atoms fuse to form helium under immense pressure and temperature. This fusion releases a tremendous amount of energy in the form of light and heat. The energy produced in the core then radiates outward, eventually reaching the Earth's surface and providing warmth and light. This process has been ongoing for about 4.6 billion years and will continue for several billion more.