Comet

=Comet=

A comet is an icy small Solar System body that, when close enough 'to sun displays a visible coma (a thin, fuzzy, temporary atmosphear) and sometimes also a tail. Comet contain some nucleus and that called Comet nucli and this will make it loose the Comet`s ice, dust and small rockey particals. Comet have a wide range of orbiting periods and short-period comets originate in the Kuiper belt, Longer-period comet are thought to originate in the Oort cloud (a cloud of icy bodies in the outer Solar system). short period comet are generally defined as having orbital periods of less than 200 years, and they usually orbit more or less in the ecliptic plane in the same direction. Long-period comets have highly eccentric orbits and periolds ranging from 200 years to over millions of years (Definiton they remain gravitationally bound to the sun thoes comets that ejected from the solar system due to close passes by major planets are no longer proplerly consider as having "periods") and their orbits take them far beyond the outer planets at aphelia, and the plane of their orbits need not lie near the ecliptic.Comet`s Physical characteristic: Comet nucleus- Comet nucleus is composed of rock, dust, water ice, and frozen gases. Comma and tails- The streams of dast and gas thus released from a huge, extreamly tenuous atmosphere around the comet is called cmma, and the force exerted on the comma by the Sun`s radiation pressure and Solar wind cause an enourmouse tail to form, which point away from the sun. Comma and tail, both are illuminated by the sun and may become visible from Earth when commetpasses through the inner Solar System. Single-apparition comets are similar to long-period comets, but have parabolic or slightly hyperbolic trajectories when in inner Solar system. Isaac Newton described comet as compact and durable solid bodies movng in oblique orbits, and Newton suspected that comets were the origin of the life supporting component of air. He also belived that the vapors givin off by the comet might replenish the planet`s supplies of water. Every year hundreds of tiny comets were passing through the inner Solar System and few of them were been noticed by general public. Evry decade or so, comet will become bright enough to be noticed by a people and that comet were called Great Comets. In past time this kind of bright comet inspired panic and hysteria in the general population, being thought of as bad omens. More recently during the passage of Halley`s Comet in 1910, The Earth passed through the comet`s tail, and erroneous newspaper reports inspired a fear that cyanogen in the tail might poison million of peopls. But still Great Comet is simply a beautiful spectacle.




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