An ultraviolet image refers to a picture that captures light that is not visible to our eyes. It shows things that emit or reflect ultraviolet light, which is of a higher frequency than what we can see. Full definition
In this extreme ultraviolet image from NASA's Solar... (longroom.com)
Until now, researchers have tracked disease - fighting bacteria in the body by genetically engineering them to glow green in ultraviolet images. (sciencenews.org)
The photograph here is an extreme ultraviolet image of the sun taken on March 30. (scientificamerican.com)