✔ 最佳答案
That same stupid story has been popping up every few weeks for the last couple of years.
As always, it's total garbage.
If such a thing were likely, it would be headline news world-wide...
NASA have a page with full details of all "Near Earth" objects which is continuously updated.
Look at the "LD" column, that gives distance relative to the Moon's distance - so units of a quarter million miles.
http://neo.jpl.nasa.gov/ca/
There was a (relatively) close pass on the 21st, only around 100,000 miles away and six to nine metres across..
That table is just near future "close approach" objects - they are actually tracking around 15,000 asteroids and have full orbital details of those. If anything was going to happen, it would be big news.
http://neo.jpl.nasa.gov/cgi-bin/neo_elem