Comets in UV

Abstract: Comets are important "eyewitnesses" of Solar System formation and evolution. Important tests to determine the chemical composition and to study the physical processes in cometary nuclei and coma need data in the UV range of the electromagnetic spectrum. Comprehensive and complete studies require for additional ground-based observations and in-situ experiments. We briefly review observations of comets in the ultraviolet (UV) and discuss the prospects of UV observations of comets and exocomets with space-born instruments. A special refer is made to the World Space Observatory-Ultraviolet (WSO-UV) project.