Lyman-alpha emissions

Lyman-alpha emissions occur when hydrogen atoms in space absorb high-energy ultraviolet light, causing their electrons to jump to a higher energy level. When these electrons return to their original level, they release a specific wavelength of ultraviolet light known as Lyman-alpha radiation. This emission is a key marker for astronomers studying the universe, as it helps reveal the presence and distribution of hydrogen gas in galaxies and intergalactic space, providing insights into cosmic structures and the processes of galaxy formation.