The Year in Pictures -- 2006
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Valles Marineris Mars' 'Grand Canyon'
An image based on Mars Odyssey's observations of Valles Marineris, the "Grand Canyon of Mars," shows sights that resemble parts of the desert West of the United States, but on a vastly greater scale. Here the canyon averages over a hundred miles wide, and its floor is heaped with rocks, sediments and landslide debris.

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  Jet Propulsion Laboratory
   California Institute of Technology