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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