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the crater. It would be 18 mile wide, 20.9 kilometer fireball. So 4,190,814 people would die from the fireball. 394,137 people would receive third degree burns and 510 people would receive a second degree burns. So you can see, although this one is not as big as you want to wipe out the guy in the store 66 million years ago, you can still feel the damage if something around one kilometer could do.