Cometary composition refers to the study of the materials that make up comets, which are icy bodies that orbit the Sun. Comets are believed to be remnants from the early solar system and are composed of ice, dust, and rocky material. By studying the composition of comets, scientists can gain insights into the chemical and physical processes that occurred in the early solar system, as well as the origins of water and organic molecules on Earth. Analysis of cometary composition often involves using telescopes to study the light emitted by comets, as well as sending space probes to collect samples from comets directly.