Comets are giant balls of rocks and ice that orbit a star. They are made up of 3 main parts: the nucleus, the coma, and the tail. The nucleus of a comet is made up of ice, gas, dust, and rocks. It is found right at the head of a comet. The nucleus of a comet is usually frozen. The nucleus can also be made out of solid forms of gases such as Methane or Carbon dioxide. The coma is mostly made out of gas. It wraps around the nucleus of the comet. It is mostly made out of water vapor, Carbon dioxide, or even dust. The tail of the comet is mostly made out of gases or dust. Halley’s Comet orbits around the Sun at a very slow pace in the outer parts of the Solar System and only passes Earth every 75 years!!