"The existence of any vesicles on Titan would demonstrate an increase in order and complexity, which are conditions necessary ...

And, much like the water cycle on Earth, Titan's liquids – formed of hydrocarbons like methane and ethane – cycle between sky and shore, evaporating to form clouds and falling as rain.

Titan’s Methane Lakes Could Form Bubble-Like Structures Essential to Life, Scientists Say There could be life as we know it, or rather as we don't know it, forming on Saturn's largest moon.