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(Click on any image for a larger view)
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| MOC image of various types of clouds. (Malin Space Science Systems/NASA) | Viking 2 Orbiter image of wave clouds near the south pole of Mars. This complex pattern of clouds is caused by winds passing over the craters. (NASA) | Viking 1 Orbiter near Mars' northern polar cap showing a cyclonic weather system. (NASA) |
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| This Viking 1 Orbiter image shows clouds to the north of Valles Marineris that look similar to cirrus clouds on Earth. (NASA) | This Viking 1 Orbiter image shows a low pressure cell near the north pole of Mars. These clouds are low in the atmosphere and most likely composed of water ice. (NASA) | Cloud over the slope of Ascraeus Mons, imaged by the Viking 1 Orbiter. (NASA) |