MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Huygens probe at Titan. Artist's impression of the Huygens probe descending toward the surface of Titan, the largest moon of Saturn. A huge electrical storm is seen in the clouds, accompanied by a rain of liquid ethane. Huygens is seen here under its main parachute, which allows the probe time to make measurements of the middle atmosphere. Huygens is a European project included in NASA's Cassini mission, and will arrive at Titan on 27 November 2004. Thick clouds containing organic compounds obscure the whole surface, preventing study by previous spacecraft such as the Voyager missions.
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