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' POSSIBLE that an asteroid hits the Earth?

In the past the Earth has been hit by asteroids. The most striking example is the Tunguska incident in Siberia on June 30, 1908 7:14 of a meteorite of about 30 meters in diameter fell in the area. The result was the killing of some 65 million trees over an area of \u200b\u200b2150 square kilometers. The sound of the explosion was heard up to 1000 kilometers away and the huge glare caused by the impact was seen even at much greater distances. In London it was midnight, but the sky lit up like daylight.
Luckily the meteorite fell in an uninhabited area. What would happen if he fell on a big city?
65 years ago, millions of tourists and became extinct on our planet, the dinosaurs that lived 160 million years. Their extinction was due to the fall of an asteroid probably 10 miles in diameter. This asteroid fell on the Yucatan, Mexico, causing a crater of 180 kilometers in diameter. His fall resulted in the development of huge quantities of dust which spread throughout the atmosphere of our planet. The Sun is "dark" for tens of years and the intense cold caused the end of the dinosaurs.
A similar event also happened 250 million years ago and caused the almost total extinction of life on our planet.
These events can be repeated? How likely is that a large asteroid will strike it down again on Earth? Scientists estimate that some 100,000 asteroids and comets wander near the earth. Of these, 20 000 are a possible threat of an impact with Earth. NASA telescopes currently available, allowed to now identify and observe a third of these celestial objects, about 6330. "Bringing in these encounter during their journey to Earth orbit and in the future could become a possible threat to our planet," said NASA's Lindley Johnson experienced.
On the other hand, if you look at the surface of the Moon or Mercury, you see that are characterized by hundreds of meteorite craters, but these two celestial bodies are devoid of atmosphere. The smaller asteroids can not reach the Earth's surface because they are burnt, crushed and pulverized due to the enormous friction that arises when they enter the atmosphere. The craters caused by asteroids larger in their impact with Earth are difficult to identify because of erosion over the centuries of weather (wind, rain, snow, hail, rivers and streams due to erosion, etc. ...).
A threat to the Earth he ran March 2, 2009, when an asteroid about 40 meters in diameter was increased to 63,500 kilometers from Earth, very short distance in astronomical terms, but the worrying fact is that NASA had identified only February 27!
The next event is expected to be kept under control in 2036 when the asteroid Aphosis (390 meters long) crosses the orbit of the Earth. The certainty in the path of this asteroid will have only in 2029.
The NEAT (Near Earth Asteroid Tracking) is the organization that is responsible for controlling the asteroids, but that remains to be considered for now have not been yet identified all the asteroids exist.