Ultraviolet observations involve studying light that is not visible to the human eye, specifically in the ultraviolet (UV) spectrum. This type of light has shorter wavelengths than visible light and can reveal important information about celestial objects, such as stars, galaxies, and nebulae. By using specialized instruments, scientists can detect UV radiation emitted by these objects, helping them understand their temperature, composition, and distance. Astronomers often use space-based telescopes, like the Hubble Space Telescope, to conduct ultraviolet observations. Earth's atmosphere absorbs much of the UV light, making ground-based observations challenging. These observations contribute to our knowledge of the universe, including the formation and evolution of various astronomical phenomena.