Why the Earth and Titan?

Well, there are good reasons to consider the Earth and Titan in one category. In a nutshell, Titan is the only world that we know which looks similar to the Earth. Certainly, the temperature is different, and surface chemistry is exotic, but the overall picture: mountains shaped by erosion, river valleys meandering through the landscape, shorelines, lakes and seas, clouds and rain - all is there.

It seems certain that we are about to witness the birth of a new science. In principle, it will be a science parallel to hydrology, so it is only fitting that it should be called methanology. If we look for further parallels, the hydrological cycle will become a methanological cycle on Titan, and hydrogeology could easily become methatitanology...

Anyway, let us look for some comparisons:

 

 

Earth

Titan

Surface temperature

K

292

94

Density

g/cm3

5.515

1.88

Mass

kg

5.794 x 1024

1.346 x 1023

Escape velocity

km/s

11.182

2.6452

Albedo

-

0.37

0.21

Surface pressure

105 PA

1

1.496

Atmosphere

 

N2, 02

N2, CH4

Surface liquid

 

H20

CH4

Interior

 

silicates, iron

silicates, water ice 55-45

Surface gravity

m s-2

9.81

1.35

 

 

 

 

 

 

 

 

 

 

 

 

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