Comets Are A Big Thing What Is it

               
Not long ago, many people thought that the comet is a sign that something bad was about to happen to them. People did not understand how objects in the sky have been transferred, near a comet should be disturbing to many. Many historical records and works of art which record the appearance of comets and terrible events such as wars or plagues are connected with.The most famous comet Halley famous astronomer Edmund Halley in a comet is named after. Halley correctly then 76-year orbit around the sun accounted for. The comet appeared in 1910 in the 76 years since the great astronomer calculated from the published 1986. 1985-1986 Giotto spacecraft in the inner solar system known as Halley's most recent visit to the most famous comet, Halley, visited.

Unlike the other small bodies in the solar system, comets have been known since long. Sometimes comets dirty snowballs or "icy mud balls" are called. Comets are invisible except when they are near the sun. Comets small, fragile, irregularly shaped bodies composed of a mixture of non-volatile grains and frozen gases are. They bring a highly elliptical orbit around the sun and a lot of them deeply into space, often beyond the orbit of Pluto swing,'s. Structure comet nucleus, coma, hydrogen cloud and the tail consists of dust. Comet structures are diverse and very dynamic, but they all scattered cloud of material around the coma, that usually grows in size and brightness as the comet approaches the sun. Usually a small, bright center (less than 10 km in diameter) appears in the middle of a coma. Coma of the comet head building with Center.

As comets approach the sun too bright tail of material that extends for millions of kilometers from the head, away from the sun. As long as the sun, the center is very cold and its material is frozen solid within the center.
In this case, Comets sometimes dirty iceberg "or" dirty snowball, "since over half of their material is ice are referred to as. Hub surface of a comet a few AU of the Sun approach within, heating up, and volatiles evaporate. evaporated molecules boil and small solid particles with them, forming gas and dust coma of the comet taken. while the center is frozen, it just reflects the sun's light can be seen by.

Sometimes meteor showers occur when the Earth passes thru the orbit of a comet. Some are very regular: Perseid meteor shower every year between August 9 and 13 occurs when the Earth passes thru the orbit of Comet Swift Tuttle.Now we know where the comet ice and dust that periodically outer reaches of the solar system in the center of the lumps, and it makes some comets frequently visits. The comet came close enough heat from the sun began to evaporate. Long tail of gas and dust jets that we can see from Earth are. Sometimes the tail can be millions of miles long