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    Saturn's largest moon, Titan, is known for its dense, planet‐like atmosphere and large lakes most likely made of methane and ethane. It has been suggested that Titan's atmosphere and surface are a model of early Earth. Since the early 2000s, NASA's Cassini space probe has been unlocking secrets of the distant moon.
    Pluto
    Atmospheric escape
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    Fractionation of planetary systems is both interesting and puzzling. While the Jovian satellite Io seems to be enriched with sulfur and Europa and Ganymede with ice, Titan - the largest moon of Saturn is enriched with organics, and it is the third body in our solar system known to have significant atmosphere after Earth and Venus. Thus, Titan has at least two confirmed key ingradients for life as we know (energy and organics). Models suggest that Titan's interior is composed of fractionated rocks, minerals, and ice (water), making Titan's interior potentially habitable.
    Atmosphere of Titan
    Water ice
    Icy moon
    Enceladus
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    Extraterrestrial Life
    Atmosphere of Titan
    Citations (2)
    Titan, the largest satellite of Saturn, is the only moon with a substantial atmosphere in our solar system. The Cassini-Huygens mission by NASA/ESA (2004–2017) returned a wealth of information about Titan's atmosphere and surface environments. Titan exhibits remarkable similarities with Earth. Active organic chemistry in the atmosphere, a dynamic methane hydrological cycle, and the internal global water ocean are all unique features of astrobiological interest. The exploration of Titan's organic environment provides us with a unique opportunity to understand abiotic, possibly prebiotic, chemistry on a planetary scale.