To continue reading this content, please enable JavaScript in your browser settings and refresh this page. Preview this article 1 min Box Canyon, a 300-megawatt ...
Add Yahoo as a preferred source to see more of our stories on Google. First imaged by NASA's Mariner 9 spacecraft in 1972, Valles Marineris has been captured by the HiRISE camera on NASA's Mars ...
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Add Yahoo as a preferred source to see more of our stories on Google. Arizona's Grand Canyon may be awe-inspiring, but it's just "a scratch" compared to the massive Valles Marineris Canyon on Mars.
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