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Saturn's north pole retains its bluish hue in this true colour image, taken by the Cassini mission, even as northern winter is coming to an end. The origin of the azure blue of Saturn's winter hemisphere is not quite clear. Storms create the look of a pockmarked surface.

CREDIT: NASA/JPL/Space Science Institute.

Source:
http://photojournal.jpl.nasa.gov/catalog/PIA10558