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.
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