Don't worry, the 140 meters wide asteroid 2011 AG5 that has been thought to have a big chance to impact Earth in 2040 has been called off. It had a chance of 1 to 500 to impact, but it has not. The asteroid will pass Earth by 550,000 km that is beyond the orbit of the Moon. The Torino Level for 2011 AG5 is 0. The only asteroid now that is above Level 0 is the 130 meter wide asteroid 2007 VK184
http://www.space.com/19045-asteroid-ear ... unked.html