Saturn's rings cut across this view of the planet's largest moon, Titan, in this image taken by the Cassini spacecraft on May 12, 2011. NASA/JPL-Caltech/Space Science Institute hide caption

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NASA/JPL-Caltech/Space Science Institute

The Cassini spacecraft has been taking radar images of Titan for years now. This modified image of the Ligeia Mare, a sea on Titan's north pole, is a composite of some of those. NASA/JPL-Caltech/ASI/Cornell hide caption

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Scientists Observe Springtime Changes On One Of Saturn's Moons

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