On Mars, Dry Ice 'Smoke' Carves Up Sand Dunes

SPACE.com
On Mars, Dry Ice 'Smoke' Carves Up Sand Dunes
NASA's Mars Reconnaissance Orbiter snapped this series of pictures of sand dunes in the north polar region of Mars, showing how dark sand rises to the top as spring progresses (from left to right) and a surface layer of carbon dioxide ice crack
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