Meteorite

=Meteorite=

A mereorite is a natural object originating in outer space that survives impact with the Earth`s surface. Meteorite cabe big or small depends on hat size they falls. Most meteorites derive from small astronomical object called meteoroids, but they are also sometimes produced by impact of asteroids. When it enters the atmosphere, impact pressure causes the body to heat up and emit light, that forming a fireball, also known as Meteor or shooting star. More generally, a Meteorite on the surface of any celestial body is a natural object that has come from eleswhere in space. Meteorites have also been found on the Moon and Mars. Large meteoroids may strikes the ground with a significant fraction of their cosmic velocity, leaving behind a hypervelocity impact crater. The kind of crater will depend on the size, composition, degree of fragmentation, and incoming angle of the impactor. The force of such collisions has the potential to cause widespread destruction. The most frequent hypervelocity crating events on the Earth are caused by Iron meteoroids, which are most easily able to transit the atmosphere intact. Most Meteorite are stony meteorites, classed as chondrites and achondrites and only 6% is Iron meteorite or a blend of rock and metal. About 86% of the Meteorite that fall on the Earth are chondrites, and about 8% is achondrites (meteorite that doesn`t contain chondrules) some of which are similar to terrestrial mafic igneous rocks, then about 5% of meteorite that fall on Earth is Iron with intergrowths of iron-nickel alloys, such as kamacite and taenite. Until the 20th century, only a few hundreds meteorite finds had ever been discovered. Over 80% of these were iron and stony-iron meteorites, which were easily distinguished from local rocks. Meteorites were been discovered in many other countries like USA, Antartica, Australia, Sahara desert, Oman.

List of Notable large impact craters:

 * Acraman crater in South Australia (90 km diameter)
 * Brent crater in Northen Ontario (3.8 km diameter)
 * Chesapeska Bay impact crater (90 km diameter)
 * Lonar crater in India (1.83 km diameter)
 * Miolnir impact crater in the Barents Sea (40 km diameter)
 * Nordlinger Ries crater in Bavaria, Germany (25 km diameter)
 * Popigai crater in Russia (100 km diameter)
 * Vredefort crater in South Africa, the largest impact crater on Earth (300 km diameter from an estimate 10 km wide meteorite)


 * click on link to go to || Martin Newa ||
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 * click on link to go to || Asteroid belt ||
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 * click on link to go to || Comet ||