A recent article in the New York Times highlighted that during the four years Cassini has been at Saturn, the level of liquid in the methane lakes of the southern hemisphere of Titan have dropped. The methane lakes were originally detected by radar instruments onboard the spacecraft. Because Cassini has had a unique opportunity to study the planet and it's moons over time, the changes can be linked to seasons on Titan.
Image credit: NASA/JPL/Caltech
Full article here: http://www.nytimes.com/2010/07/27/science/space/27titan.html?_r=2
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