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Canyon Valles Marineris on Mars
Canyon Valles Marineris on Mars

Image: NASA/JPL-Caltech (Mars); STScI Graphics (overlay)

This image of Mars, taken by the Viking Orbiter 1 spacecraft, reveals the huge canyon Valles Marineris. The canyon stretches 3,000 miles across, which is as wide as the continental U.S. (shown as a white outline overlay).