The nucleus of a comet is primarily composed of ice, including water ice, carbon dioxide ice, and other frozen gases.

The coma is the bright, fuzzy region surrounding the nucleus of a comet, caused by the sublimation of ice and dust as the comet approaches the Sun.

Ammonia ice is not a common type of ice found in comets. Water ice, carbon dioxide ice, and methane ice are more prevalent.

Solar radiation, particularly ultraviolet radiation, causes the sublimation of ice and dust from the comet's nucleus, forming the tail.

Gas tails are not a common type of tail observed in comets. Ion tails, dust tails, and plasma tails are more frequently seen.

The Rosetta spacecraft successfully landed a probe named Philae on the nucleus of Comet 67P/Churyumov-Gerasimenko in 2014.

Hale-Bopp Comet, discovered in 1995, is known for its exceptionally long tail, which at one point stretched over 500 million kilometers.

Halley's Comet has an orbital period of approximately 76 years, meaning it takes about 76 years to complete one orbit around the Sun.

Shoemaker-Levy 9 Comet collided with Jupiter in July 1994, providing valuable insights into the composition and structure of comets.

The Stardust spacecraft collected samples from Comet Wild 2 and returned them to Earth in 2006, providing valuable information about the composition of comets.

Borrelly Comet is known for its distinctive greenish coma, caused by the presence of diatomic carbon molecules.

The nucleus of a typical comet is typically around 10 kilometers in diameter, although some comets may have larger or smaller nuclei.

Hyakutake Comet was observed to have two distinct tails during its 1996 appearance, one composed of dust and the other composed of ions.

The Deep Impact spacecraft visited two comets, Tempel 1 and Hartley 2, and successfully impacted them with probes to study their composition and structure.

Wild 2 Comet is known for its exceptionally high rotation rate, completing one rotation in just a few hours, making it one of the fastest-rotating comets observed.