Comets

The nucleus and the coma compose the core of the comet. The nucleus is the solid, rocky part at the center, while the coma is the surrounding cloud of gas and dust that forms as the comet gets closer to the Sun and begins to vaporize.

The name of the comet seen in 1986 is Halley's Comet. You can see it every 75-76 years, and is the only short period comet that is clearly visible to the naked eye from earth, and thus the only naked-eye comet that might appear twice in a human lifetime.

In mid-September 2011, the following comets are brighter than magnitude 12

as seen from Earth:

-- P/2007 R5 SOHO

-- C/2010 X1 Elenin

-- 45P Honda-Mrkos-Pajdusakova

-- C/2009 P1 Garradd

Most "asteroids" are in orbit around the Sun, unless disturbed by gravity or collisions. Comets may orbit the Sun regularly, or be drawn in from the outer solar system and pass by the Sun on their way back out (hyperbolic comets).

The surface of a comet is primarily made up of dust, rock, and ice. This mixture forms a layer called the coma, which is the thin outer crust covering the rocky and icy nucleus of the comet. Additionally, comets can also contain organic compounds and other volatile materials.

the Oort Cloud, which is a spherical shell of icy objects located at the outermost reaches of the solar system. These comets are believed to originate from the early days of the solar system and occasionally get gravitationally nudged towards the inner solar system.

Comets are believed to have two sources. Long-period comets (those which take more than 200 years to complete an orbit around the Sun) originate from the Oort Cloud. Short-period comets (those which take less than 200 years to complete an orbit around the Sun) originate from the Kuiper Belt. Danish astronomer Jan Oort proposed that comets reside in a huge cloud at the outer reaches of the solar system, far beyond the orbit of Pluto. This has come to be known as the Oort Cloud. Statistics imply that it may contain as many as a trillion comets and may account for a significant fraction of the mass of the solar system. However, since the individual comets are so small and so far away, we have no direct evidence about the actual existence of the Oort Cloud. The Kuiper Belt is a disk-shaped region past the orbit of Neptune roughly 30 to 100 AU from the Sun. The Belt contains many icy bodies which can become comets. Occasionally the orbit of a Kuiper Belt object will be disturbed by gravitational interactions with the giant planets in such a way as to cause the object to take up an orbit that crosses into the inner solar system. Although the Oort Cloud is much farther away from the Sun than the Kuiper Belt, it appears that the Oort Cloud objects were formed closer to the Sun than the Kuiper Belt objects. Small objects formed near the giant planets would have been ejected from the solar system by gravitational encounters. Those that didn't escape entirely formed the distant Oort Cloud. Small objects that formed farther out had no such interactions, and remained as the Kuiper Belt objects.

The star's absolute magnitude is a measure of its intrinsic brightness. Sirius appears brighter from Earth than a star with a greater absolute magnitude because Sirius is closer to us, which affects its apparent brightness. The star with the greater absolute magnitude might be intrinsically brighter but is much farther away, leading to its fainter appearance from Earth.

Apparently scientist do not know the answer . The number given as 1 bajillion mph is an indication that the number is considerably a very large number and cannot be pinned down .

There may be no concern for knowing the answer just yet , or man has not been able to calculate its speed .

Perhaps one day ( like when Haley's Comet returns in the year 2061 ) someone will find the answer , and make use of it somehow.

The bolt pattern for a 1966 Mercury Comet is 5x4.5 inches (5x114.3 mm). This means there are 5 lugs or bolts on the wheel hub and the distance between each stud measured in a circular pattern is 4.5 inches.

The comet responsible for the Leonids meteor shower is Comet Tempel-Tuttle, which takes about 33 years to complete one orbit around the sun. When Earth passes through the debris trail left behind by this comet, we experience the annual Leonids meteor shower.

Some believe there once was a planet during our time in 1938 called vulcan. It's supposedly broke up from the heat and gravitation pull of the sun. The same thing that would happen to anything else. It's just to violent of a region. Perhaps Vulcan is still there.

Comets do not have atmospheres in the same way that planets do. Instead, they have a thin envelope of gas and dust, called a coma, that forms as the comet gets closer to the Sun and begins to heat up. This coma can extend hundreds of thousands of kilometers from the comet's nucleus.

Halley's comet was predicted by Edmund Halley he took the comets of 1531-1607-1682,

and using Newton law of gravitation (who was Halley good friend) and predicted when that comet would return in 1758 and sure enough on Christmas eve of 1758 it returned.

oh and by the way he did not live to see it and also they called him a nut job that whole year Untill its return

Every 75 years and a few months. Last seen in 1986 the next sighting will be 2061.

The difference between a comet and an asteroid is asteroids are made up of metals and rock materials, while comets are made up of ice, rocks, and dust. Both of them were formed more than 4.5 million years ago.

The longest comet tail on record belongs to the Great Comet of 1844, which had a tail that stretched for over 300 million kilometers. Comet tails can vary in length depending on factors such as the comet's size, composition, and proximity to the Sun.

Halley's comet is really just an icy rock that orbits around the sun just like the planets do. The difference is, instead of it taking just one year to go around the sun like Earth does, it swings way out to the outer edge of the solar system on every orbit, and takes 75 years to make a complete circle.

The only time we ever see it is when it comes close to the sun, in Earths neighborhood. It spends all the rest of that time way out in space zipping along in the dark.

The last time this happened was in 1986. Halley's comet isn't due back until 2061!

It depends on the chemical make-up of the comet in question. For example, Lulin (Comet C/2007 N3) is a bluish-green color because it's massive atmosphere is made of cyanide gas and diatomic carbon.

1 - Halley's

2 - Lovejoy

3 - Hale-Bopp

4 - Ison

5 - Shoemaker-Levy 9

Note:

Obviously that's a matter of opinion to some extent. I would have a different list.

See "related link" below for a list of some famous comets.

Note: Unfortunately, the photo and caption for the "eclipse comet of 1948" is wrong

in this link.

situation I: They fly until get caught by gravity from another planet and then get burned up entering the atmosphere or crash on the planet.

situation II: They fly until they approach a star and over time get burned up. What's left is decent sized rocks.

GIVE ME TRUST POINTS

The ion tail of a comet always points directly away from the sun due to the solar wind pushing charged particles emitted by the comet.

its called a dirty snowball because of the wau it looks