What is the main component of a comet’s nucleus?

Cometary nuclei are primarily composed of ice and dust, with a mixture of frozen water, carbon dioxide, ammonia, and methane. As a comet approaches the Sun, its nucleus heats up, causing sublimation of these volatile ices, which leads to the formation of a coma and tail. The dust component includes silicates and organic material, contributing to the overall mass and structure of the comet. Since comets are remnants from the early solar system, their icy composition provides valuable insights into the conditions of the primordial solar nebula and the role of cometary impacts in delivering water and organics to early Earth.