Comets are composed of a mixture of rock, ice, and gas.

The nucleus of a comet is typically 1-10 kilometers in diameter.

The tail of a comet is made of gas and dust that is expelled from the nucleus as the comet approaches the Sun.

Halley's Comet has an orbital period of 76 years.

Hale-Bopp is known for its extremely long tail, which was visible for 18 months.

Shoemaker-Levy 9 collided with Jupiter in 1994, creating a series of dark spots on the planet's surface.

The Chicxulub impactor is believed to have caused the extinction of the dinosaurs 66 million years ago.

The Chicxulub Crater is located in the Gulf of Mexico and is the largest impact crater on Earth.

The Chicxulub Crater is estimated to be about 200 kilometers in diameter.

The Chicxulub Crater is estimated to be about 65 million years old.

The Clovis comet is believed to have caused the Younger Dryas impact event 12,900 years ago.

The Younger Dryas impact crater is estimated to be about 20 kilometers in diameter.

The Younger Dryas impact crater is estimated to be about 12,000 years old.

The Tunguska comet is believed to have caused the Tunguska event in 1908.

The Tunguska impact is estimated to have released energy equivalent to 10 megatons of TNT.