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Titan or Saturn VI is the largest moon of Saturn, the only moon known to have a dense atmosphere, and the only object other than Earth for which clear evidence of stable bodies of surface liquid has been found.
"It's comforting to find that Titan is so amazingly Earth-like in so many ways, but it's fascinating to find so much that's a mystery," said Stephen D. Wall, a leader of the Cassini radar team at NASA's Jet Propulsion Team. "We're seeing dunes of ice grains like deserts," he said Wednesday, "and drainage channels that look for all the world like the Amazon, and volcanoes and impact craters and lakes." Titan's surface is even cleaved in areas by long dark streaks that closely resemble Earthly tectonics -- the continental rift zones and seismic faults that keep our planet in a constant state of unrest, Wall said. "That moon is amazingly Earth-like," he said.
So will Titan become like the Earth? Not in the near-term anyway. In order to provide the thermal radiation to increase Titan temperature to habitable levels, the sun would have to substantially increase in brightness. In about 4 billion years (give or take), the sun will enter a red giant phase. And during that brief period, Titan could get enough thermal energy to begin to transform into a world capable of sustaining life as we know it. On the other hand such thermal transformations will undoubtedly effect its daddy, Saturn, and in turn also effect Titan. So it is unlikely Titan will become like the Earth. But there may still be reasons to go to Titan. While we might not like to enjoy a day on the Titan liquid methane beaches, we might like to use the natural elements to fuel our space craft as we continue our journey through the solar system or perhaps onward to the stars. Plus Titan is an excellant laboratory, with a view of the early solar system and perhaps early Earth frozen for us to examine.