As the title says, a (rather more) asteroids, are with view to an impending impact with our planet, that as a result of numerous observations made by NASA through the Hubble Space Telescope, and many others around the world have shown that about 100,000 asteroids threaten to hit or pass close to our world, including 850 diamtro measuring a kilometer or more.
The first, and the nearest, called 2002 NT7, which is estimated will make impact with the ground on 1 February 2019 in Europe, the which has a volume of 4,400 million cubic meters, a diameter of 2.03 km, a mass of 11,000 tons, reached a speed of 26.24 km / s, on impact generera an energy of 1 million megatons (something like 59,000 Hiroshima bombs at the same time), q is estimated provoke tsunamis, earthquakes and hurricanes to 1,000 km radius, a drop of 8 ° C week in temperature, loss of crops and severe damage to the atmosphere, so do not go to Europe by that time hehe. 
The second most dangerous observed by NASA Apophis is 999,942, the exact date is April 13, 2029, at 4:36 a.m. Greenwich meridian time, 250 meters wide and 25 million tons, passed through the orbit of the moon and walked in our planet at a speed of 45,000 km / h, unleashed the energy of 65,000 Hiroshima bombs. Asimple view may be observed (the first in human history), imagine it will be more catastrophic than 2019, but of course NASA is already in the development of strategies to deflect or destroy these and the 850 asteroids that threaten our planet. 
In an upcoming post, will speak on NASA's strategies in this area, which is our universe quiet isn't it? The information about asteroids can be obtained from the NASA site: http://www.nasa.gov/ Or its English version: http://www.lanasa.net/ .
Pedro Vivas.
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