An asteroid the size of an aircraft carrier has passed near Earth on Nov. 8, 2011. It hasn't hit Earth for sure, and that's why you are still reading this article resting on a chair.
Here, we are more interested on if that meteor would have hit Earth then what would have happened ??..A famous asteroid impact expert says that a similar-sized object hitting Earth would result in a 4,000-megaton blast, magnitude 7.0 Earthquake and, should it strike in the deep ocean, 70-foot-high tsunami waves 60 miles from the splashdown site.
NASA scientists reported this week that the asteroid 2005 YU55 will pass between Earth and the moon and come within 201,000 miles of Earth on its closest approach. So there is absolutely no chance that it can hit our planet…unless the motion of our earth gets disturbed by some magnitude due to some cataclysmic event…like a Mega-Tsunami or a Super-volcanic explosion in the mean time…
Then…if by chance it hits the earth and drops in a city like Chicago, it will prove to be...the doomsday meteor...it would obliterate the entire city and leave few survivors. According to NASA, the last time an asteroid this size came close to Earth was in 1976, and the next known approach of such a large asteroid will be in 2028.
The most recent impact of this size is not known, but there are about 20 similar craters known in the geologic record, including the Wetumpka crater in Alabama and the Rock Elm crater in Wisconsin. Of the known large craters, the most recent are the six-mile-wide Bosumtwi crater in Ghana, which is about 1 million years old, and the nine-mile-diameter Zhamanshin crater in Kazakhstan, which is about 900,000 years old, Melosh said.