Saturn has made appearances in fiction since the 1752 novel Micromégas by Voltaire. In the earliest depictions, it was portrayed as having a solid surface rather than its actual gaseous composition. In many of these works, the planet is inhabited by aliens that are usually portrayed as being more advanced than humans. In modern science fiction, the Saturnian atmosphere sometimes hosts floating settlements. The planet is occasionally visited by humans and its rings are sometimes mined for resources. The moons of Saturn have been depicted in a large number of stories, especially Titan with its Earth-like environment suggesting the possibility of colonization by humans and alien lifeforms living there. A recurring theme has been depicting Titanian lifeforms as slug-like. Saturn Early depictions – solid For a long time, Saturn was incorrectly believed to be a solid planet capable of hosting life on its surface. The earliest depiction of Saturn in fiction was in the 1752 novel Micromégas by Voltaire, wherein an alien from Sirius visits the planet and meets one of its inhabitants before both travel to Earth. The inhabitants of Saturn have been portrayed in several different works since then, such as in Humphry Davy's 1830 novel Consolations in Travel and the anonymously published 1873 novel A Narrative of the Travels and Adventures of Paul Aermont among the Planets. They are occasionally portrayed as warlike yet benevolent, as in the 1935 short story "The Fall of Mercury" by Leslie F. Stone where they aid humanity in a war against Mercury and the 1933 short story "The Men without Shadows" by Stanton A. Coblentz where they come to Earth as conquerors in order to turn it into a utopia. In other works, they are evil, such as in Clifton B. Kruse's 1935 short story "Menace from Saturn" and its 1936 sequel "The Drums". In the 1890 novel The Auroraphone by Cyrus Cole Saturnians face a robot uprising, and in the 1900 novel The Kite Trust by Lebbeus H. Rogers they built the Egyptian pyramids. Saturnians are typically depicted as more advanced than the people of Earth, including in the 1886 novel A Romance of Two Worlds by Marie Corelli and the 1894 novel A Journey in Other Worlds by John Jacob Astor IV; in both of these stories they resolve theological questions. Exceptions to this general trend include the 1886 novel Aleriel, or A Voyage to Other Worlds by W.