Pictured here is one of the 'Birdmen of Titan' rising high above Cassini, Titan's capital, sometime in the 23C.

Titan was one of the most interesting places in the system. A rarity, for it was a low G moon with a dense atmosphere. Throw in the rich supplies of Nitrogen and hydrocarbons, Titan becomes the most habitable place in the outer system. It was also the place where human powered flight was possible. With its gravity only 14% of Terra, an average human weighs 9 kg. The dense atmosphere is 50% denser than Terra, so human powered wings can generate sufficient thrust to fly. Hence the famous Birdmen of Titan.