US GEOLOGICAL SURVEY / SCIENCE PHOTO LIBRARY US GEOLOGICAL SURVEY / SCIENCE PHOTO LIBRARY
Computer-processed image of Olympus Mons, Mars. Olympus Mons is the largest known volcano in the Solar System. Its summit rises 27km above the surrounding plains (Mount Everest is 8.8 km high), and the volcano measures 600km across its base. This image was produced by combining medium- resolution digital images from the Viking orbiters with low-resolution colour information.
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