Asteroid That Zipped By Was Half a Mile Wide
A huge asteroid whizzed by Earth early this week about 269,000 miles from the surface -- slightly farther away than the moon. The asteroid, discovered in 2004, is estimated to be as wide as half a mile, one of the largest to fly so close to Earth in the last few years. Its closest approach Monday was over the West Coast. Scientists think 2004 XP14 will have 10 more close encounters with Earth this century, none expected to pose a threat.