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Viking 1 image of Valles Marineris,a deep canyon on Mars
NASA / JPL Image
 

Image 1-7
Valles Marineris

This image from the Viking 1 spacecraft shows Valles Marineris on Mars. This huge canyon is over 2500 miles long and 4 miles deep. This makes it five time longer and 4 times deeper then the Grand Canyon on Earth.

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