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At first glance this hilly desert landscape appears to show islands of trees casting shadows on reddened soil.
But this strange winter wonderland of dusty dunes, icy rivulets and dark outcrops lies 62 million miles away on Mars. And the 'trees,' pictured by a Nasa probe, are actually trails dislodged sand. In winter a layer of carbon dioxide ice covers the dunes but this evaporates in spring causing dark material to streak down the slopes.