RICHARD BIZLEY / SCIENCE PHOTO LIBRARY RICHARD BIZLEY / SCIENCE PHOTO LIBRARY
Huygens probe at Titan, artwork. The probe is entering the atmosphere of Titan, the largest moon of Saturn (ringed planet at upper left). The 1. Titan by the Cassini spacecraft (launched in 1997, not seen). The Huygens probe entered Titan's atmosphere on 14 January 2005. After the probe's atmospheric entry, a parachute was used to bring it safely to the surface. The probe found that Titan's atmosphere is mainly nitrogen with clouds of methane and ethane. The surface is a mixture of water and hydrocarbon ice.
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