Comets

Do you mean lighter in color? Halley's comet has an albedo of about 0.04, which is the color of tar. Our Moon has an albedo of about 0.07, which is the color of weathered asphalt.

If you mean lighter as in less massive... we've never seen a comet as massive as our Moon, but there are some pretty tiny moons out there in the outer solar system; a few comets might be larger than some of them.

It is pushed away from the sun by the solar wind.

The current belief of virtually all astronomers is that comets were "specks" of leftover detritus from the formation of our solar system. Being the lightest of those "specks", they orbit the sun at the farthest distance - the Oort cloud, estimated to be about a light year from our sun. Note, though, that in this usage, "speck" means a ball of dirt laced with ices that's about 3 to 10 kilometers wide.

Comets are constantly entering and leaving the inner solar system. However, scientists have theorized that many comets are gathered in a wide area far beyond the planets of the solar system, in a location called the Oort Cloud (for Danish astronomer Jan Hendrik Oort). According to this theory, a huge spherical region surrounds the solar system at a distance of up to 1 light year (50,000 AU) from the Sun. Tiny gravitational effects of the Sun and planets (or even other stars) would pull comets from the region on an irregular but continual basis.

Once comets passed the orbit of Neptune, some would be trapped by gravity and continue to orbit the Sun, with periods of from a few years to several hundred years, until they were either ejected, evaporated, or collided with a larger body. Cometary collisions are one possible source for the water on the early Earth.

I have no idea but maybe a meteor?

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It is called a Coma.

No. There is no comet or asteroid or meteor going to hit the Earth. Most of it is superstition.

Asteroids are the celestial bodies found in between the spaces of the planets of the solar system. But comets are mysterious bodies that go far away from the known solar system and come back once very rarely.

When Halley's Comet passed in the early XXth Century, there was just enough science to analyze the chemical content of the tail, but not enough scientific familiarity in the general population to make sound evaluations about scientific findings.

It happened that spectrography showed the comet's tail, through which the Earth would pass, contained hydrogen cyanide, which everybody knew was a poison. What they failed to appreciate was the extremely low concentration of it.

Of course, there's a long history of comets scaring people, as folks are used to a very steady and unchanging sky and anything that goes "wrong," such as a comet or an eclipse, simply MUST be cause for concern.

Comets are celestial bodies that orbit the sun. They are composed of ice and dust.

A meteor is an object (perhaps a comet or a piece of one) that has struck the atmosphere and become superheated so that it leaves a fiery trail. When it has struck the ground, it is a meteorite.

The distance of a comet from the sun varies greatly. Much more so than for any of the planets, in fact. Comets orbit the sun in long, long eliptical orbits. The orbits of comets can take them from the inner planets outward to space far beyond the orbits of the outer most planets.

The average size of a comet can vary greatly, ranging from a few hundred meters to tens of kilometers in diameter. The nucleus of a comet is typically smaller than a few kilometers, while the coma and tail can extend over much larger distances due to the interaction with the solar wind and radiation pressure.

i believe in superstition because it helps us to be learn more but i think with scientific basis......

The tail of a comet is made up of a combination of frozen rock, and ice particles coming off the comet and is lit up by the sun. If you were to be in this tail, you would face: subzero temperatures and constant pummeling by SOLID ice and rock.

This is because as they approach the Sun, gravity acts more on them and they speed up. They then have enough momentum to "sling" themselves back out of the solar system. Gravity will slow them down again as they travel away from the Sun and so on it goes.

The famous writer Mark Twain- Samuel Langhorne Clemens was born in the year of Halley"s appearance and died, also in the year of it"s appearance in l9l0. No major world crisis was ( Keyed) to the Comet, the Titanic disaster came in 4.l4-l5.l2 two years down the pike.

All comets (there are over 3,500 known) have different time-scales for their appearances.

These depend on the length of their orbits - some comets have extremely large orbits which take them from being 'close' to the earth to almost going out of our solar system.

They appear because they come close enough to the Earth to be seen, and then they may take anything from a few years to hundreds of thousands of years beore they come back.

The best-known comet is Halley's Comet which has a period of between 75 and 76 years between appearances.

Comets originate in the 'Oort Cloud' - a cloud of ice and debris surrounding the solar system far out beyond the orbits of the planets. If one of these pieces of debris manages to succumb to the sun's gravitaional pull rather than hat of the surrounding bits of debris, it will begin an orbital path round the sun, in an elongated elipse (like a cigar-shape). This is what we call a comet. As the comet is in orbit round the sun, it will reappear near earth at intervals.Some comets have a relatively short reappearance time - the most famous being Halley's Comet at 76 years. Some comets take 3000 years to reappear or even more. When it approaches the sun at distance it is simply a block of ice and rock. However, when it gets near the sun, the solar wind ( a stream of radiation from the sun) and radiation melt the surface of the comet so that a tail emerges. (actually two tails form - but the reasons need not be explored here). The characteristic tail is what we see when looking at a comet. The tail always faces away from the sun (not behind the comet in the direction of travel, which is commonly, but wrongly believed) because of the solar wind pushing away debris in a direction opposite to the sun. After its orbit the comet will return to the Oort cloud as its tail disappears (as the solar wind has less effect) to begin its journey round the sun again. After several journeys, the comet will lose more and more material (that forms the tail) because of the Solar wind. There will come a time when the comet eventually dies out like an icecube melting on a hotplate.

Yes, meteors (meteoroids entering Earth's atmosphere) do not have tails. However, when a meteoroid vaporizes upon entry, it can create a glowing trail of light behind it known as a meteor train, which can appear as a temporary tail.

It rather depends on the path of the comet. Some comets (such as Encke's comet) return in as little as 20 years - others might not return to our solar system for centuries (Comet McNaught has an orbital period of over 92,000 years !) It's possible to see at least one comet per year if the weather conditions ar favourable.

Some meteor showers are caused by Earth passing through the remnants of an old comet or parts of the trail of debris left by comets. The Leonid meteor shower is caused by Earth passing through the trail of comet Temple-Tuttle.

The comet's tail forms as it approaches the Sun because the Sun warms the comet up and it starts to sublimate. That cloud of gas that forms the tail points away from the Sun because of the force of the Solar Winds that are generated by the Sun's emmisions into space.

They come from the outer reaches of space.