"Scientists Discover Eerie Green Glow in Martian Night Sky"

Scientists using the ExoMars Trace Gas Orbiter (TGO) have observed Mars' atmosphere glowing green for the first time in visible light, a phenomenon known as airglow. This unexpected discovery could have implications for future missions to Mars, as the intensity of the nightglow in the polar regions could be mapped and monitored by relatively inexpensive instruments in Martian orbit. Studying Mars' nightglow will provide insight into the composition and dynamics of the planet's upper atmosphere, which is otherwise inaccessible to direct measurement. Additionally, understanding Mars' atmosphere can aid in the design of spacecraft and equipment for future missions.