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Mars - Valles Marineris (C)
Another section of Mars's four-thousand-kilometre canyon system.
The actual model file, as it will be printed. Drag to turn it.
A different stretch of Valles Marineris, deep enough in places that clouds form inside it.
Published by NASA in their 3D Resources collection, which they state is free of copyright. Printed to order — scaled to about 80 mm on its longest side, and resizeable on the next page.