Ultraviolet light in Space
Hot objects, such as the Sun radiate ultraviolet light (blocked, for the most part, by our atmosphere). Some of the hottest stars shine more brightly in ultraviolet light than in visible. The centers of many galaxies glow brightly in ultraviolet light; it’s a telltale sign of gas heating up as it spirals closer and closer to the central giant black hole.
imagined ultraviolet to be on the cool end of the spectrum - guess I better look for a graphic!