Near the sun: A cometary nucleus has a "corona" (a vapor outgassing of it's nucleus, up to a million times wider than the comet itself - this is what we see as the "head" of the comet), and one or several "tails". The "tail" we usually see is the vapor trail, but sometimes a secondary gas trail is also visible. Far from the sun, it is just the nucleus. Typically 3 to 10 kilometers wide, oddly shaped, like a potato or a peanut and, somewhat surprisingly , very dark in color, like soot.
nucleus
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During a comet's orbit, the coma and tails are the parts that come and go. The coma is the glowing, fuzzy cloud around the nucleus that develops as the comet gets closer to the Sun. The tails, consisting of ion and dust tails, form as a result of solar radiation and solar wind pushing the coma's particles away from the nucleus. Both the coma and tails diminish as the comet moves away from the Sun during its orbit.
Both when Samuel Longhorne Clemens (Mark Twain) was born, and when he died, the Halley Comet was visible.
They both revolve around the sun and they are both smaller than planets or moon.
A comet is a small solar system body that orbits the Sun. When close enough to the Sun, a comet exhibits a visible coma (fuzzy "atmosphere"), and sometimes a tail, both because of the effects of solar radiation upon the comet's nucleus . Comet nuclei are themselves loose collections of ice, dust and small rocky particles, ranging from a few kilometers to tens of kilometers across. So no Mars doesn't have a comet it does have a moon tho.
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.
During a comet's orbit, the coma and tails are the parts that come and go. The coma is the glowing, fuzzy cloud around the nucleus that develops as the comet gets closer to the Sun. The tails, consisting of ion and dust tails, form as a result of solar radiation and solar wind pushing the coma's particles away from the nucleus. Both the coma and tails diminish as the comet moves away from the Sun during its orbit.
A comet's tail points away from the sun. Sometimes the dust and gas separate, though, because they are driven by two different effects, radiation pressure and solar wind, respectively. Both point mostly away from the sun, but not always exactly. Photographs of Comet Hale-Bopp show this effect well, for example, the Astronomy Picture of the Day at the link shown. A comet in deepest cold space is generally thought of as a giant dirty snowball with the snow made of water ice, and frozen organic liquids, and the dirt of small rocks and dust which are the debris of explosions and collisions of different bodies in space. It is only when the comet approaches the sun and warms up that surface ice melts and vapourises carrying dust with it and forming a large cloud that we can see clearly. It is at this stage when the effects mentioned above act on the cloud and sweep it behind the comet relative to the sun to form a tail or tails, and because there is no atmospheric air in space the tail always points away from the sun even when the comet is travelling away from it.
Both of the comet tails are pushed away by the light and solar wind that is always streaming out of the Sun. This means the tails always point away from the Sun. The dust tail may curve a bit, but the plasma tail points directly away, so that the two tails may seem to form a "V".
The dust tail and the gas tail BOTH point away from the Sun (or in the direction of the Solar Wind). As the gas tail is a little less dense, its point is a little more directly away.
They are. We generally first see comets as they approach the Sun and become visible; if the comet survives the near approach to the Sun, we can continue to see them as they move away from the Sun. Depending on the comet's orbit as compared to the Earth's, we sometimes can't see the comet very well until after it is already moving away from the Sun. And of course, the first three comets discovered in 2010 were all discovered by satellites watching the Sun - as the comets fell INTO the Sun.
Its called the 'Coma'. Its is both the dust that the solar wind blows off the comet as well as gases expelled as the comet heats up.
You do if you have trouble seeing like blurry or double vision up close or far away or both
Comets are composed mostly of various kinds of ice (which is to say, frozen liquids and gases, not just water ice) and when they approach the sun parts of them will boil away, which produces the distinctive comet's tail. Farther from the sun they have no tail, and remain frozen.
Both when Samuel Longhorne Clemens (Mark Twain) was born, and when he died, the Halley Comet was visible.
They are both pieces of rock in outer space and... They are shiny :)))
They both revolve around the sun and they are both smaller than planets or moon.
A comet is a small solar system body that orbits the Sun. When close enough to the Sun, a comet exhibits a visible coma (fuzzy "atmosphere"), and sometimes a tail, both because of the effects of solar radiation upon the comet's nucleus . Comet nuclei are themselves loose collections of ice, dust and small rocky particles, ranging from a few kilometers to tens of kilometers across. So no Mars doesn't have a comet it does have a moon tho.