At one time the appearance of a comet causing people cower, according to their words, the comet or tail star or a star, the star of cube, star or a broom, is a harbinger of less good about the coming disaster, war and death will be fall the Earth.
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now we've got a clear picture as to whether why the comet, although before the whole puzzle about this comet could be revealed, at the time a comet first appeared, it looks like a comet as a point of light, whereas the actual centre line reach thousand of miles in length.
point light is the "head" or "nucleus" of the comet, experts of sciences predicted that the comet was a large cluster of various substances mixed with dense gas, where does the first coming of the solid that is still question mark for us.
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at the time of the comet approached the Sun, usually appear a kind of tail behind it, form the shape of the tail it consists of a thin layer of gases and particles of substances that smooth where the head of a comet, when the comet was on the environment the influence of the Sun.
surrounding the comet's head there is a third part that we know by the name "coma". it consists of the material of hot clouds which sometimes reach the mid line 150.000 miles or even more.
the tail of the comet is very different to each other, both in form and size, some short and some are oval, more long and lean, its length is usually the least reach a size of 5 million miles, sometimes to almost 100 million, but there are also some of the comets that have not tail.
the more tails of comets develop, means the faster the comet approached the Sun slid with his head directed forward first, and then there was one thing that was odd, when the comet begins to distance himself from the Sun, then its tail turns into position at the front, this is caused by the pressure of the Sun's light highlight that drives the smallest particles which are suspended in the comet's head is always in the direction of the opposite from the direction of the Sun.
as a result, when the comet leaving the Sun, then its tail should walk in front of the left, in the course of the Sun ,the comet gradually slowing its velocity and finally vanished from our eyes, comets can remain disappeared during specific period, but at most comet often appears back on at any time.
comets travel in alternates around the Sun, but spend a bit long for a comet to travel the one round, Halley's Comet for example take 75 years to complete one trip around the Sun.
until now, experts have managed to find a falak science 100 comets, but supposedly there is still several hundred thousands of comets in our solar system, this area which remain invisible to us.
