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Clouds in motion over Titan's northern lakes This animated sequence of Cassini images shows methane clouds moving above Ligeia Mare, a large methane sea on Saturn's moon Titan. Cassini captured the views between July 20 and July 22, 2014, as it departed Titan following a flyby. Cassini tracked the system of clouds as it developed and dissipated over Ligeia Mare during this two-day period. Measurements of the cloud motions indicate wind speeds of around 3 to 4.5 meters per second. The timing between exposures in the sequence varies. In particular, there is a 17.5-hour jump between the second and third frames. Most other frames are separated by one to two hours. NASA / JPL / SSI