What is so strange about Titan's atmosphere is that it is more dense than Earths, by 1.6 times! The atmosphere is composed mainly of nitrogen, but there is also about 10 percent methane. Reactions in the methane and other compounds react to sunlight to produce a reddish photochemical smog. Titan is probably the smoggiest world in the solar system!

  Methane probably exists in all three forms on Titan. It would be a gas in the atmosphere, but it could also rain down out of the clouds and exist as snow or ice on the surface. Even stranger things may be raining out of Titan's atmosphere as well, things like gasoline like substances, ethylene and acetylene and hydrogen cyanide! Titan's surface is likely covered by an ocean of liquid methane and ethane.

     What is so interesting about this smoggy swampy world is that there may be biochemical reactions among these organic molecules. Titan may indeed be very similar to a primordial Earth when life first formed! It will be fascinating to see what the Casinni Spacecraft discovers when it reaches Saturn and its moons.