Date: 3/31/2004

Two weeks after 2004 FH passed, the asteroid known as 2004 FU set a new record for closest encounter, zipping 4,000 miles past the Earth. That's the least scariest part. Considering its minute size of only six meters, scientists were only able to detect FU a few hours before it nearly grazed our atmosphere. Could it have caused serious damage? Not likely, as the Earth's atmospheric friction would have burnt the rock to a crisp.