Comets are made of ice, rock, cosmic dust, ammonia, carbon dioxide, methane ice and water. Density will vary depending on it's exact composition. Being that its primary component is water ice, it's specific density will be very close to 1. That is a comet is likely just less dense than water. A large comet if landed softly in the ocean would probably float.

We generally believe that comets with orbits of 200 years or less, traveling in the ecliptic plane, come from the Kuiper Belt. Those comets with longer orbits, or that travel at angles to the ecliptic plane, come from the Oort Cloud.

Billions.

Ice & dust.

Comets are lumps of rock or ice broken away from larger comets or asteroids. These do not only orbit the sun but other planetary systems around our universe.

They orbit our sun due to the tremendous gravitational force the sun has. It pulls everything around it with less gravity than its self towards it. A well known comet is Haley's comet, which has been orbiting the sun for millions of years. It is locked in a orbit like we are around the sun, and this one particular comet is next estimated to pass Earth again in 2065.

Smaller comets hit earth's atmosphere every day and are seen as shooting stars at night because they are simply too small to penetrate the dense gasses surrounding our planet. These are the size of grains of sand and up-to small cars.

150,000 tonnes of space material of rock and ice enter Earth as a result of gravity from the earth pulling space debris towards us.

While asteroids and comets have different constitutions - asteroids are mostly metals and rocks while comets consist of water-ice, dust and rock - with comets potentially being potentially less dense, comets travel much faster than asteroids. An asteroid may travel upwards of 40,000 miles per hour, a comet travels over 150,000 miles per hour.

Halley's comet's mass (weight) is exactly 2.2×1014 (TO the power of 14)

Comets are just very icy asteroids, they become comets when a large enough of a body of mass, i.e. jupiter or saturn. When this happens, the asteroid gets thrown into an extremely high elliptical orbit. They ideally have an orbit perpindicular to the ecliptic.

.42 in comparison to Earth which represents 1

The Hale-Bopp comet is relatively rare - it only passes close to the Earth once every 76 years.

In the last pass, there were several groups that felt there were supernatural or mystical properties of the comet. Some of these groups were covered by the media, although I don't believe anything horrible happened.

There is a very big comet that passes the earth about every 76 years. It's called the Halley comet!

A 1951 recording on Holiday Records entitled Rocket 88 - a version of the rhythm and blues song by Jackie Brentson converted into rock and roll by way of the addition of a country music arrangement - is considered Haley's (and the world's) first true rock and roll record. However a recently discovered 1950 recording entitled Teardrops From My Eyes reveals Haley was already taking rhythm and blues songs and adding country western arrangements a year earlier than Rocket 88.

none, they burn up before they can hit it

don't worry about it go to another website

They are from extreme outer parts of the solar system (known as "Kuiper belt") and from a huge cloud of comets lying far beyond the orbit of Pluto, completely surrounding the Sun (known as "Oort cloud").

the Halley's comet does not have atmosphere

Sort of. There is an asteroid headed in earths direction, scientists just haven't calculated if it will hit or miss. They feel strongly that it will come within 26 thousand miles of earth. However they are not yet certain of that. This will not happen till 2029. If the asteroid does hit earth it will end ALL life on earth, it will sterilize our planet. The asteroid I believe is the size of manhattan.

Since the halley comet appears every 75-76 years, and was last seen in 1986, it is easy to calculate when it appeared, or will appear again. So, the data you have seams incorrect. Next, it wil appear in the Solar system in the early summer (Europe) in 2061

Hale-Bopp

blah blah blah in the milky way or up you dairyair