One place where water can be found on Mars is in clouds . Scientists don't yet know, however, why these clouds formed , and why some stick to the canyons . One exciting possibility is that water sometimes condenses in shaded regions of the canyon s, only to evaporate into clouds when exposed to the morning Sun . Water in any form on the Martian surface might be important to sustaining life and possible future human exploration . The region shown is about 100 kilometers across.
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