River channels on three worlds reveal a history of shifting landscapes

Enlarge / Ligiea Mare, the second largest body of liquid hydrocarbons on Titan. (credit: NASA/JPL-Caltech/ASI/Cornell)

At this point, we’ve worked out the basics of the processes that produced the topography around us here on Earth. But other worlds in our solar system have very different landscapes that could partly be the result of foreign processes. The distant glimpses we get of these worlds make revealing those landscape histories a real challenge. Reconstructing a crime from a...

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