HII region

An HII region is a large cloud of glowing, ionized gas found in space, often around young, hot stars. These stars emit intense ultraviolet light that strips electrons from surrounding hydrogen atoms, creating a plasma that glows brightly in visible light. HII regions are important sites of star formation, acting as cosmic nurseries where new stars are born. Their brilliant appearance helps astronomers study the process of stellar development and the composition of the interstellar medium.