A huge crater measuring some 19 miles wide has been discovered in the Saharan desert. Scientists believe the crater, named 'Kebira' (Arabic for "large"), was formed by a space rock that was three-fourths of a mile wide. The impact from such an asteroid would have destroyed everything for hundreds of miles. Researchers from Boston University discovered Kebira by examining satellite images of the region. Read more from Space.com(1).

1. http://www.space.com/scienceastronomy/060303_big_crater.html