But the lack of smaller surface channels and other features argue that the valley was formed by a surface collapse. Further images of Martian valley systems will help distinguish the degree to which these processes affected the Martian surface. This image was recorded on January 8th by the Mars Global Surveyor 's camera during its 87th orbit of the red planet . The area pictured is about 6 miles wide. High resolution versions of the image show features that are as small as 40 feet across.
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