-> because Titan is so cold, about -179 C at the surface, much of this 
-> methane is stored in the atmosphere, which is ten times denser than 
-> earth's. 
  
No it isn't. The density of Titan's atmosphere at the surface is very 
similar to Earth's. However, Titan's gravity is only about one-seventh 
of Earth's. The mass of the atmosphere per unit surface area is 
something like ten times Earth's, which makes the pressure and density 
at the surfaces of the two bodies roughly equal. 
  
                             dow 
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