Five times deeper than Earth's Grand Canyon ➡ The Solar System's Grandest Canyon: Valles Marineris - #mars http://t.co/E3S9eLjZ
October 24, 2012
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The Solar System's Grandest Canyon: Valles Marineris | SpaceRef - Your Space Reference
Earth's Grand Canyon inspires awe for anyone who casts eyes upon the vast river-cut valley, but it would seem nothing more than a scratch next to the cavernous scar of Valles Marineris that marks the face of Mars.