What process powers a star and produces its energy?

Stars, including our Sun, produce energy through a process called nuclear fusion. This happens deep inside the star’s core, where it is extremely hot and under high pressure. In this process, hydrogen atoms combine to form helium, releasing a huge amount of energy as light and heat. This energy then travels outward and shines into space. Nuclear fusion is what keeps a star glowing for millions or even billions of years. It’s the same process scientists are trying to copy on Earth to create clean energy in the future.