Collisions+!

 Impact of a meteor !

=__ ASTEROID __= Asteroid is a medium-sized rocky object orbiting the Sun; smaller than a planet, larger than a meteoroid. Asteroids show no evidence of an atmosphere or other types of activity associated with comets. Asteroids can be lass that one-mile to almost 600 miles in diameter. media type="youtube" key="yYgEwXWilUc" height="344" width="425" 
 * __FORMATION OF A METEOR __**
 * Meteroid **

A meteoroid is small sand to boulder sized particle of debris in the Solar System. The visible path of a meteoroid that enters Earth's atmosphere is called a meteor. Many meteors are part of a meteor shower.  Meteoroids become meteorites when they enter the Earth's atmosphere. Since they have speeds of five to 25 kilometers per second (up to 50,000 miles per hour), they are rapidly heated by the friction of the upper atmosphere and leave a trail of incandescent hot gas. They first become luminous at altitudes of 60 to 120 kilometers and travel tens of kilometers before burning out. The typical visible meteor is probably caused by a particle about the size of a grain of sand. **Meteors**  Some meteorites, called the carbonaceous condrites, have almost the identical abundance of the elements as the atmosphere of the Sun. Since they are uniform in composition (undifferentiated), they have not been melted, which can cause various elements to segregate. Thus they seem to be little changed from the early Solar System when the planets were first forming. Various dating techniques indicates these objects are about 4.6 billion years old; confirming geological estimates of the age of the Solar System. About 90% of chondrites are called ordinary condrites and they have been changed by heating and differentiation. Thus they are thought to have been formed deep inside much larger bodies which compressed and heated them. These parent bodies were then broken up, probably by impacts and the debris floated around the Solar System until, by pure chance, they were swept up into the Earth's atmosphere. Finally, there is a group of chondrites called achondrites, that are made up of a common kind of lava. These too must have come from larger bodies that compressed enough under the force of their own gravity to melt rocks. So, most meteors come from larger Solar System bodies that have broken into smaller pieces. For many of these, they are probably the result of impacts over billions of years of the smaller bodies of our Solar System.

Meteorites do not emit any dangerous gas. However, they can uncover organic matter decomposition and can fill the air with methane (CH4), hydrogen sulphide (H2S) and carbon dioxide (CO2). Their structure and their parts are very similar in all of them and is the following:



Studies have shown that the biggest risk is presented of an asteroid of 1 to 2 kilometres, with devastating power similar to several tens of billions of megatons of TNT.

**__Is there any impact of a meteor on Earth? __**

In the event of impact against the Earth, would be capable of disrupting the global climate and cause a mass extinction of living things. Some of these apocalyptic impacts have occurred millions of years ago. One of the best known is that supposedly caused the extinction of the dinosaurs, some 65 million years, at the end of the Cretaceous period. While the scientific debate remains open, the more established theory refers to an asteroid about 10 kilometres in diameter struck the Yucatan peninsula in the Gulf in Mexico. There are also strong indications that 250 million years ago disappeared in a short space of time 90% of marine life and 70% of terrestrial life.

The impact left more than a collision of a meteorite with the Earth is the extinction mass, which in reality is associated with side effects that leave the impact, as global warming, earthquakes, racing cars, the destruction of the ozone layer, acid rain and clouds dust. These abrupt changes of environmental conditions on the planet cause the loss of biomass, which is known as mass extinction. On our planet, scientists have realized that the structures of meteorite impacts are abundant ancient and complex geology. This type of impacts has led to changes in the Earth's crust, made to vary the temperature and has participated in the mass extinction. On Earth have been found more than 160 impact craters, most of them located in Northern America, Europe and Australia, but it is believed that is much to discover.

**__Can we avoid the collision ?__** It is very difficult to protect us with a effective method but we can investigate to develop new sources and new forms for break meteor collisions. <span style="font-size: 12pt; font-family: 'Arial','sans-serif'; mso-ansi-language: EN-GB; mso-fareast-font-family: 'Times New Roman'; mso-fareast-language: ES; mso-bidi-language: AR-SA;"> Using a method of electromagnetic propulsion, in order to remove dusty field we can shoot away, to give a slow push and stabilizer. Place a sheet in the form of aluminized reflective film to wrap around the asteroid, causing it to act as a "solar sail" to use the pressure of sunlight into the orbit of the object. Cover with white powder to the object produce the same adjustment using the Yarkovsky effect (Yarkovsky effect occurs because the surface of a rotating asteroid is heated by the sunlight, and cooled by passing your hemisphere "Night" ; because of this, the asteroid tends to radiate more heat from the illuminated hemisphere. This imbalance in the thermal radiation from the object produces a weak acceleration). media type="youtube" key="rH-NTr4cc04" height="344" width="425"

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