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Mariner 9 View of Nirgal Vallis
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

Page Last Updated: August 1st, 2013
Page Editor: NASA Administrator