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Nature, Volume 517 Number 7532. Dunes on Titan in a Cassini radar mapper image taken 21 Dec 2008 (upper part of image) resemble those in Conception Bay in the Namib desert, seen here from 283 km altitude in NASA crew image STS107-E-5380 (lower part of image). NASA’s Cassini spacecraft mission — still sending data from the Saturnian system — has revealed extensive aeolian (wind-formed) dunes on the surface of Titan, Saturn’s largest satellite. Cover: NASA/JPL-Caltech/ASI/ Johnson Space Center