US GEOLOGICAL SURVEY / SCIENCE PHOTO LIBRARY US GEOLOGICAL SURVEY / SCIENCE PHOTO LIBRARY
Computer-processed mosaic of Mars, made from data gathered by the Viking Orbiters in 1980. At the top of the crescent is the bright Arabia region. At centre right is the dark, low-relief basaltic shield Syrtis Major Planum. Near the bottom is the carbon dioxide ice cap near the South Pole.
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