Scientists have calculated that the trajectory of the asteroid Apophis in 2029 and 2036 did not intersect the Earth's orbit. However, in 2068 it has a cosmic body, though small, but still possible, to face our planet. Its power is equal to the collision giant thermonuclear bomb explosion in more than 500 megatons of TNT.
This probability is only 2.3 per million, but due to recent events and the meteoric dozhdemnad Chelyabinsk astronomers calculate all the options again. Its small "chance" asteroid got when passed inspection uncertainties associated with changes in the orbit of Apophis after approaching to the Earth in 2029 at a distance of 37.6 thousand km from the center of the planet. In the view of the scientists were so-called "keyhole" that are associated with collisions in future encounters.
If, by changing its orbit, the asteroid will fall into a hole at the time of closest approach to the Earth, its fragments, not burned during the passage of the atmosphere, are more likely to fall into any of the continents. In 2036 the passage through "keyhole" is completely eliminated, the probability is less than 1 per million, but in time for the April 12, 2068, that is, the Day of Cosmonautics, the orbit of Apophis may lie precisely in one of the 20 identified "keyhole "width of 2 meters, so that earthlings have reason to fear.