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Curiosity Mariner 9 Nirgal Vallis
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Curiosity Mariner 9 Nirgal Vallis

April 17, 2013
Mariner 9 View of Nirgal Vallis This view of channels on Mars came from NASA's Mariner 9 orbiter. In 1971, Mariner 9 became the first spacecraft to enter orbit around Mars. Image Credit: NASA/JPL-Caltech


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