A 400m wide asteroid named 2005 YU55 will come close to earth about wednesday, within the moon orbit but NASA is confident it will not hit earth (this time), but hell, what if it hits the moon!?
BUT, aparently another named Apophis, about 270m across, will come close on April 13, 2029 and has a remote chance of hitting Earth when it comes around again on April 13, 2036.
Apophis will make a fairly close approach to Earth in late 2012 and early 2013.
Well now, I wonder what the effect of two large meteriotes in short succession and their gravitational pull will have on the earths weather?