Essay On Titan

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Titan: Climate and Atmosphere
Titan, otherwise known as Saturn VI, is a very unique moon. 50% larger and 80% more massive than earth’s lone moon and larger even (but 40% less massive) than the planet Mercury, Titan is the second largest moon in our solar system after Jupiter’s Ganymede. Titan has 1/7th the gravity of earth and is tidally locked to Saturn, with identical orbital and rotational periods of approximately 16 earth days.
Apart from its size, Titan’s uniqueness is twofold – it is the only known natural satellite in our solar system with both a non-negligible atmosphere and stable liquid on its surface. Not only is Titan distinct from other moons, it also appears quite different from Earth – the liquid on its surface is not water, but a mixture of various hydrocarbons.
Titan’s opaque atmosphere prevented in-depth understanding of its surface until NASA’s Cassini-Huygens mission in 2004, which used radar and special filters to penetrate the haze and first detect the liquid hydrocarbon lakes in Titan’s polar regions.
As a result of Titan’s weak gravity, its atmosphere extends almost ten times further from its surface than earth’s own atmosphere, and is over seven times more massive on a surface area basis. The dissimilarities continue: Nitrogen constitutes a much greater portion of the atmosphere at 98.4%, and methane is the second most prevalent gas at 1.4%. Hydrogen gas constitutes most of the remaining 0.1-0.2%, but there are also traces of other more complex hydrocarbons and gases (such as acetylene, ethane, propane, hydrogen cyanide and cyanogen). Neither water nor oxygen are found in Titan’s atmosphere in significant quantities.
The opacity and orange hue of Titan’s atmosphere are likely the results of Tholin pollu...

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... lead many to consider life on Titan an impossibility. However, there are multiple points in favor of Titan’s ability to support life. The presence of a “methanological” cycle provides a medium for theorized non-water-based life, where living things comparable to the methanogens found on earth could take in hydrogen in place of oxygen, metabolize it with acetylene in place of glucose, and produce methane in place of carbon dioxide. It is also predicted (via interpretation of rotational data) that Titan might contain a global sub-surface ocean (of water), providing basis for more “conventional” forms of life. The composition of the atmosphere provides one of the more compelling arguments for life on Titan – many of the “primitive atmosphere” gases and their experimental outputs discovered in the Miller experiment discussed in lecture last week are present on Titan.

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