"Titan's lakes" . "hydrocarbon seas" . "hydrocarbon seas and lakes" . "Lakes of Titan" . "lakes and seas of liquid hydrocarbons" . "body of liquid" . "bodies of liquid hydrocarbons" . "lake on Titan" . "lakes and seas of liquid methane" . . "Lakes of methane and ethane" . "lakes" . "lakes and seas in Titan" . "rivers, lakes, and seas" . . "liquid hydrocarbon lakes" . "Lakes of Titan" . "Hydrocarbon lakes" . . "liquid methane exists on the surface" . "lake" . . "hydrocarbon lake system" . "lakes of Titan" . "Freeman Lacus" . "hydrocarbon lakes" . "lakes on Saturn's moon Titan" . "hydrocarbon lake" . "Methane Lakes" . "Titanian lakes" . "methane lakes" . "surface" . "methane\u2013ethane lakes" . "Titan" .