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A NASA spacecraft has spied a vortex swirling in the atmosphere high above the south pole of the Saturn moon Titan, hinting that winter may be coming to the huge body's southern reaches.
NASA's Cassini probe photographed the polar vortex — or mass of swirling gas — during a flyby of Titan on June 27. The vortex appears to complete one full rotation in nine hours, while it takes Titan about 16 days to spin once around its axis.