Comet Shapes and Sizes: From Fluffy Snowballs to Dusty Tails

The nucleus of a comet is primarily composed of ice, such as water ice, carbon dioxide ice, and methane ice.

The coma is the bright, fuzzy region surrounding the comet's nucleus, caused by the sublimation of ice and the release of gas.

Comets have two main types of tails: ion tails and dust tails. There is no such thing as a gas tail.

Most comet nuclei are typically in the size range of 1 kilometer to 10 kilometers in diameter.

Comet Hyakutake, discovered in 1996, is famous for its exceptionally long tail, which extended over 100 million kilometers at its peak.

Sublimation is the process by which a solid (ice) directly transforms into a gas without passing through the liquid phase.

The Rosetta mission, launched by the European Space Agency, successfully landed a probe named Philae on the surface of Comet 67P/Churyumov-Gerasimenko in 2014.

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

The Tunguska event was caused by an air burst of a comet or asteroid in 1908 over Tunguska, Russia.

The Rosetta mission, launched by the European Space Agency, visited Comet 67P/Churyumov-Gerasimenko and released a lander named Philae.

The Deep Impact mission successfully crashed a probe into the nucleus of Comet Tempel 1 in 2005.

Long-period comets have highly elliptical orbits and orbital periods that can exceed 200 years.

The Stardust mission successfully collected and returned samples of cometary material from Comet Wild 2 to Earth.

Comet Shoemaker-Levy 9 was discovered in 1993 and caused panic due to its predicted close approach to Earth. However, it ultimately collided with Jupiter in 1994.