Last updated on April 16, 2014 at 12:17 EDT
Nirgal Vallis and its Windblown Dunes
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Nirgal Vallis and its Windblown Dunes

March 19, 2003
The MGS MOC images showed the evolution of the 2001 great dust storm period. There was never a time when the entire planet was in the midst of a single storm. Several large storms would occur at the same time, and dust was kicked high into the atmosphere to cause much of the rest of the planet to be obscured. The dust storms largely subsided by late September 2001, but the atmosphere remained hazy into November of that year.