Titan is the largest moon of Saturn. It has a substantial atmosphere and is the most Earth-like satellite in the Solar System, making it a popular science fiction setting. Science fiction set on Titan can be roughly divided into the pre- and post-Pioneer eras, with a division set by the flyby of Saturn by the Pioneer 11 space probe on April 5, 1973, which showed that Titan's surface was too cold to sustain (Earthlike) life. Somewhat later, the arrival of Cassini–Huygens mission in 2004 with the Huygens probe's landing in 2005 showed the presence of hydrocarbon lakes on Titan, leading to further changes in its depiction in science fiction.