COMPOSITION Pluto's composition primarily comprises rock and ice, with a mantle of water ice covering a rocky core. Its surface features a mix of frozen nitrogen, methane, and carbon monoxide. Organic compounds like tholins, formed by solar radiation interacting with methane and nitrogen, color its surface. Trace amounts of carbon dioxide and other hydrocarbons exist. Recent findings suggest the potential presence of an underground ocean beneath its icy shell. This diverse blend of rock, ice, and complex compounds defines Pluto's intriguing and varied composition.