The element that is said to make up approximately 75% of the universe is hydrogen. As the simplest and lightest element, hydrogen plays a crucial role in cosmic processes, including the formation of stars and galaxies. In the early universe, hydrogen was created during the Big Bang and remains a primary component of stars, where nuclear fusion occurs to form helium and release energy. Hydrogen's abundance distinguishes it as foundational to astronomical and physical sciences, serving as a building block for more complex elements and compounds in the universe.