An infrared detector on the Cassini spacecraft has imaged a huge cloud that engulfs most of the north pole of Saturn’s icy moon Titan. Particles of ethane, methane, and other organic compounds in the cloud could be a source of the liquid hydrocarbon—most likely methane—that makes up the lakes that Cassini’s radar detector recently found near the moon’s north pole (SN: 8/5/06, p.
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