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Science 15 September 2006:
Vol. 313. no. 5793, p. 1537
DOI: 10.1126/science.313.5793.1537b
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This Week in Science

Scientists predicted that Titan's surface should be awash with liquid ethane, but the low and mid-latitudes of this saturnian moon are merely moist, and dunes prevail rather than seas. Griffith et al. (p. 1620; see the Perspective by Flasar) argue that a large cloud near the north pole of Titan spotted by Cassini's Visual Infrared Mapping Spectrometer may harbor the missing ethane. Similar to Earth, cold air downwells near the winter pole and causes the formation of stratospheric polar clouds. Solid ethane snow may frost the surface at the pole if the conditions are cold enough.




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