Frigid and alien yet similar to our own planet billions of years ago Saturns largest moon Titan has a thick atmosphere organicrich chemistry and a surface shaped by rivers and lakes of liquid ethane and methane Cold winds sculpt vast regions of hydrocarbonrich dunes There may even be cryovolcanoes of cold liquid water NASAs Cassini orbiter was designed to peer through Titans perpetual haze and unravel the mysteries of this planetlike moonbrbrCourtesy NASAJPLCaltech