Titan is the largest moon of Saturn and second largest moon of solar system after Ganymede ( moon of Jupiter). Titan is even bigger than planet Mercury.
Scientists are interested in studying it because Titan holds the possibility of life on it.
Though, it does not have water but there is possible pre-biotic environment and may be biotic environment in the sub surface. The atmosphere of titan is mainly composed of nitrogen and is very dense with traces o hydrocarbons. The surface of titan is liquid hydrocarbons lakes. It has weather pattern similar to Earth's. Also, it has methane cycle just like water cycle on Earth.
