Well, those guys are considerably smaller than the one that left the impact crater near Winslow Arizona but still I wouldn't want to be within 200 miles should one of them strike the Earth. The heat alone would kill everything within a 30 mile radius and it would kick up thousands of house sized boulders traveling at supersonic speeds. The kill zone would be immense. Better were it to strike a large, unpopulated spanse of the ocean in a directly downward angle (90 degrees) but even then it could spawn a tsunami. Brrr!