What is Halleys Comet's composition?

Halley's Comet is primarily composed of ice, dust, and rocky material. Its nucleus contains water ice, carbon dioxide, ammonia, and various organic compounds. This mixture gives the comet its characteristic bright coma and tail when it approaches the Sun, as the heat causes the ices to vaporize and release gas and dust. Halley's Comet is known for its periodic appearances, returning approximately every 76 years.