SPACE PHOTOS THIS WEEK: Wavy Rings, Dark Dunes, More

SPACE PHOTOS THIS WEEK: Wavy Rings, Dark Dunes, More
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June 10, 2009--Flowing around hills and mountains (light gray), black lines resembling a fingerprint trace the corrugations of dunes on Saturn's moon Titan in this May 21 radar image captured from an altitude of 600 miles (965 kilometers) by the Cassini orbiter.

Previously believed to be oceans, dark areas like those pictured were revealed to be dunes by Cassini in 2006. The discovery forced a rethink of Titan's atmosphere, which astronomers had thought lacked sufficient winds for dune creation.
—Photograph courtesy NASA/JPL
 
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