glow – n. a soft, warm light

geology – n. the study of rocks and soil and the physical structure of the Earth

aurora – n. streamers or arches of light appearing in the upper atmosphere of a planet's magnetic polar regions caused emission of light from atoms

emission – n. the act of sending gas, heat or light out into the air

scan – n. the act of scanning, or looking at all part of something

altitude – n. the height of something above sea level

photochemistry – n. a part of chemistry that deals with the chemical effects of light

mission – n. an important task, usually involving travel somewhere