pictures from mars series
A nice global view of Mars as seen by Viking 1 Orbiter. Source
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A simulation of an ancient ice age era on Mars 2.1 million to 400,000 yrs ago using Mars Global Surveyor and Viking Orbiter imagery. Variations in the axial tilt contributed greater seasonal variation and atmospheric movement of water vapor leading to the widespread ice deposits and glaciation of the mid-latitudes to 30 degrees N and S. Source