The Earth-BashersAnnalee Newitz7/17/08 10:00amFiled to: Mega impactsPlanetsSpaceCraterscometmeteor17EditPromoteShare to KinjaToggle Conversation toolsGo to permalink Mars isn't the only planet with awe-inspiring craters. Here on Earth, we've been pummeled by space rocks in the not-so-distant past, and our planet has the scars to prove it. A new photo essay in National Geographic by Stephen Alvarez tells the story of planetary impacts like this one (above) in Arizona, U.S., called simply Meteor Crater. It's almost a mile wide. Check out an even more awesome one below.