Nuclear Reactions in Stars

Nuclear reactions in stars are processes where atomic nuclei combine or split, releasing enormous amounts of energy. In stars like the Sun, hydrogen nuclei fuse through nuclear fusion to form helium, releasing energy that powers the star and produces light and heat. These reactions occur under extreme temperatures and pressures, allowing nuclei to overcome repulsive forces. Over time, stars create heavier elements through successive fusion steps, shaping their life cycle and contributing to the universe’s chemical diversity. This ongoing nuclear activity is essential for stars’ brightness, stability, and ultimately for the formation of planets and life.