NASA's Mars Global Surveyor shows a global 'snapshot' of weather patterns across Mars. Here, bluish-white water ice clouds hang above the Tharsis volcanoes.

Twelve orbits a day provide the MOC wide angle cameras a global "snapshot" of weather patterns across the planet. Here, bluish-white water ice clouds hang above the Tharsis volcanoes. The map is a mosaic of 24 images taken on a single northern summer day in April 1999.

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