GARY HINCKS / SCIENCE PHOTO LIBRARY GARY HINCKS / SCIENCE PHOTO LIBRARY
Martian landscape. Artwork from above the Martian surface, looking at a landscape of craters and canyons. A grid pattern and compass cross (top right) represent the mapping of Mars. The canyons on Mars can be be hundreds of kilometres long and are several kilometres deep in places, dwarfing similar canyons on Earth. Erosion features in the landscape, and data from exploration rovers, suggest that water once flowed here, shaping these canyons after their formation. The water was later lost and Mars is now a cold desert world with a thin atmosphere of carbon dioxide, and a surface marked by impact craters.
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