Question

what is comets and how many types of comet's​

Answer 1

This is a list of comets (bodies that travel in elliptical, parabolic, and sometimes hyperbolic orbits and display a tail behind them) listed by type. Comets are sorted into four categories: periodic comets (e.g. Halley's Comet), non-periodic comets (e.g. Comet Hale–Bopp), comets with no meaningful orbit (the Great Comet of 1106), and lost comets (5D/Brorsen), displayed as either P (periodic), C (non-periodic), X (no orbit), and D (lost).

Many of the earlier comets to be observed in history are designated with an X or D due to not having the tools to measure a comet's orbit accurately and eventually losing it. X/1106 C1 (the Great Comet of 1106) is a good example. The orbital elements for the older non-periodic comets in the list assume that the comet has an eccentricity of roughly 1, and therefore the calculations are only approximate.

Answer 2

A comet is an icy ball of frozen gas, rock and dust that orbits the sun in an elliptical path. When closer to the sun in orbit, the comet's nucleus releases gasses, which form a coma (the comet's fuzzy, glowing halo) and a tail. So, when a comet is far away from the sun, it would not have a tail. Debris left behind from a comet's tail is what causes a meteor shower.Single-apparition comets are thought to be comets that are not bound to the sun and can travel out of the solar system.

Sungrazing comets are often ill-fated comets that suffer from an Icarus problem. They are classified as comets that travel within 850,000 miles of the sun, and some of these comets burn up entirely. The Kreutz Group is a subgroup of sungrazers. According to NASA, "Many sungrazing comets follow a similar orbit, called the Kreutz Path, and collectively belong to a population called the Kreutz Group." NASA suspects that the comets currently on the Kreutz Path originated from a single comet that broke up long ago.



Dead comets, such as the recent and incorrectly named "Spooky" asteroid, are comets whose gasses have burned up. They have no tails.

Exocomets are comets that exist outside of our solar system. According to SPACE.com, scientist have identified several of these orbiting the star Beta Pictoris.