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Science 5 May 2006:
Vol. 312. no. 5774, p. 653
DOI: 10.1126/science.312.5774.653a
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This Week in Science

Figure 1 Cassini radar observations of Titan by Lorenz et al. (p. 724; see the Perspective by Lancaster) show that large regions of its surface contain parallel or 'seif,' dune fields, similar to those in the Sahara Desert on Earth. The height of the dunes is about 150 meters, and they occur in regions up to 1500 by 200 kilometers in extent, especially near the equator. The east-west alignment of the dunes and other flow features suggest that they form from the actions of easterly surface winds. The presence of dunes indicates that processes create sand-sized particles, and that Titan's equatorial surface lacks persistent liquids that would otherwise trap the sand.

CREDIT: LORENZ ET AL.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)