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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.
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11.21.2011

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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