DAVID DUCROS / SCIENCE PHOTO LIBRARY DAVID DUCROS / SCIENCE PHOTO LIBRARY
Huygens probe at Titan. Artwork of the European Space Agency's Huygens probe (lower left) entering the atmosphere of Titan (lower right), the largest moon of Saturn (background). This probe was launched from Earth in 1997 as part of the Cassini-Huygens mission. The 1.3-metre-wide Huygens probe entered Titan's atmosphere on 14 January 2005, protected by a heat shield. It then deployed its parachute for a successful landing. The probe transmitted from the surface for 90 minutes. It 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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