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Few things I learn from widkpeiia ~~~ Titan's surface temperature is about 94 K ( 179 C, or 290 F). The atmosphere of Titan is largely composed of nitrogen 95% (N2), and methane 4.9% (CH4); minor components, playing the role of aerosol, lead to the formation of methane and ethane clouds and nitrogen-rich organic smog. This atmospheric methane, being the analog of water vapor here on Earth (raining out, principle component of clouds, pooling into lakes of liquid methane around the poles), creates a greenhouse effect on Titan's surface, without which Titan would be far colder. ( I should hope so. They're always telling us that methane is 25 times more powerful a greenhouse gas than co2. The GWP of water vapor is 0.23 times that of co2, so you have to multiply by 4.35 to get the direct comparison with Earth's greenhouse. When you do the math Titan has a whopping 108.69 times the greenhouse effect we have on Earth. ~~~JM)Here's a problem. Hyperion, another of Saturn's moons, this one