Close-up grayscale image of Martian polar dunes showing dark spots where carbon dioxide ice has sublimated, revealing darker sand underneath. The thawing process creates patterns across the dunes near the Martian North Pole. The image spans approximately 3 kilometers.

Astronomy Picture from 05/08/2007

The Dotted Dunes of Mars

Source: https://apod.nasa.gov/apod/ap070805.html


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Close-up image of Martian sand dunes near the north pole, captured by the Mars Global Surveyor. The dunes, formed by southwest winds, are partially covered in carbon dioxide frost. Spring in the northern hemisphere is causing the polar cap to recede, revealing these intricate formations. The image covers a 1.2-mile region at 77 degrees North latitude.

Astronomy Picture from 14/08/1998

The Dunes Of Mars

Source: https://apod.nasa.gov/apod/ap980814.html


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