Behold: a striking composite image taken by NASA’s Odyssey Orbiter between 2002 and 2004 showing (in false colour) the long dunes surrounding the northern polar cap of Mars.

Areas touched by the sun emit a golden glow, while the chillier regions are tinted blue. The image frames  dunes carved into a 19-mile swath of land extending into an area the size of Texas. The picture celebrates the 20th year of Odyssey – launched in 2001 – the longest-running spacecraft in history.


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