Saturn\u2019s moon Titan is perhaps one of the most fascinating moons in the Solar System. It\u2019s the second largest of all the moons in our planetary neighbourhood and is the only one with a significant atmosphere. It\u2019s composed of 95% nitrogen and 5% methane and is 1.5 times as dense as the Earth\u2019s atmosphere. The methane in the atmosphere of Titan is what puzzles scientists. It should have all be broken up within 30 million years causing the atmosphere to freeze but it hasn\u2019t! There must be an internal process replenishing it, but what is it?<\/p>\n
<\/p>\n Titan is the largest moon of Saturn and second only in size to Ganymede, the largest moon of Jupiter. The surface of Titan is covered with dunes, icy mountains, and liquid hydrocarbon lakes\u2014primarily composed of methane and ethane. Beneath its icy crust, scientists believe a vast subsurface ocean of water exists, raising the possibility of microbial life. NASA\u2019s Cassini-Huygens mission provided detailed insights into Titan\u2019s climate, seasonal changes, and its resemblance to early Earth, making it a target for future exploration.<\/p>\n Dr. Kelly Miller from the South West Research Institute and Lead author of a paper about Titan\u2019s atmosphere said \u201cWhile just 40% the diameter of the Earth, Titan has an atmosphere 1.5 times as dense as the Earth\u2019s, even with a lower gravity, walking on the surface of Titan would feel a bit like scuba diving!\u201d To try and understand the existence of methane in the atmosphere Southwest Research Institute joined forces with the Carnegie Institution for Science to conduct some experiments with interesting results.\u00a0<\/p>\n A model was proposed in 2019 that suggested just how the methane could be replenished over the years. It theorised that large amounts of organic materials are heated by the moon\u2019s interior, releasing nitrogen and carbon based gas like methane. The gas seeps to the surface where it replenishes the atmosphere. The theory was developed off the back of data from NASA\u2019s Cassini-Huygens spacecraft which arrived at the Saturnian system in 2004. It explored it for the next 13 years while the Huygens probe dropped onto the surface of Titan in 2005.\u00a0<\/p>\n The team led by Miller arranged experiments to heat up organic materials to temperatures up to 500 degrees Celsius at pressures up to 10 kilobars. This simulated the conditions found under the surface of Titan. The process generated sufficient quantities of methane that would enable Titan\u2019s atmosphere to be replenished to the levels we observe today.\u00a0<\/p>\n To learn more about the atmosphere of Titan, NASA plans to launch another spacecraft to the Saturnian system in 2028. It\u2019s been called Dragonfly and involves a quadcopter that will, like Ingenuity did on Mars, explore Titan\u2019s atmosphere. The thick atmosphere and low surface gravity make it an ideal place to explore from the air. Not only will it help us to understand more about the atmospheric conditions but it will help to assess the moon\u2019s habitability by analysing prebiotic molecules and searching for signs of past, or even present life!\u00a0<\/p>\n Source : SwRI-designed experiments corroborate theory about how Titan maintains its atmosphere<\/p>\n![\"\"](\"https:\/\/www.universetoday.com\/wp-content\/uploads\/2014\/04\/titan-haze.jpg\")
\nCredit: NASA\/JPL-Caltech\/Space Science Institute <\/figcaption><\/figure>\n![\"\"](\"https:\/\/www.universetoday.com\/wp-content\/uploads\/2015\/10\/Titan_huygens-1024x570.jpg\")
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