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}}'''Titan''' ([[Greek]] Τῑτάν first-generation god) is the largest [[satellite]] of [[Saturn]], the second-largest planetary satellite in the [[solar system]] (after [[Ganymede]]), and the only body other than [[Earth]] to have stable bodies of liquid on its surface. Titan is twentieth in order from Saturn and the sixth satellite of [[dwarf planet]] size (consistent with its official [[International Astronomical Union|IAU]] catalog designation as "Saturn VI").

}}'''Titan''' ([[Greek]] Τῑτάν first-generation god) is the largest [[satellite]] of [[Saturn]], the second-largest planetary satellite in the [[solar system]] (after [[Ganymede]]), and the only body other than [[Earth]] to have bodies of liquid on its surface for any length of time. Titan is twentieth in order from Saturn and the sixth satellite of [[dwarf planet]] size (consistent with its official [[International Astronomical Union|IAU]] catalog designation as "Saturn VI").

Until 2005, Titan was regarded as the only natural satellite in the [[solar system]] to have a true [[atmosphere]]. But the [[Cassini-Huygens mission]] has already demonstrated that Saturn's inner moon [[Enceladus]] ''also'' has an atmosphere, believed composed of ionized [[water]] vapor from repeated eruptions from [[volcano]]es and/or [[geyser]]s on its surface. This "atmosphere" is constantly escaping from Enceladus, perhaps to persist as the E ring of Saturn's ring system. Thus it requires a continuous source of replenishment. The theories of Enceladus' volcanic and/or geothermal activity are an attempt to explain this replenishment.<ref name=encelatm>"[http://www.esa.int/SPECIALS/Cassini-Huygens/SEM9RC2IU7E_0.html Cassini finds atmosphere on Enceladus]." ''ESA Cassini-Huygens, March 16, 2005. Accessed February 16, 2008.</ref>

Until 2005, Titan was regarded as the only natural satellite in the [[solar system]] to have a true [[atmosphere]]. But the [[Cassini-Huygens mission]] has already demonstrated that Saturn's inner moon [[Enceladus]] ''also'' has an atmosphere, believed composed of ionized [[water]] vapor from repeated eruptions from [[volcano]]es and/or [[geyser]]s on its surface. This "atmosphere" is constantly escaping from Enceladus, perhaps to persist as the E ring of Saturn's ring system. Thus it requires a continuous source of replenishment. The theories of Enceladus' volcanic and/or geothermal activity are an attempt to explain this replenishment.<ref name=encelatm>"[http://www.esa.int/SPECIALS/Cassini-Huygens/SEM9RC2IU7E_0.html Cassini finds atmosphere on Enceladus]." ''ESA Cassini-Huygens, March 16, 2005. Accessed February 16, 2008.</ref>