Even distant Pluto, far out in the cold dark depths at the edge of the solar system is believed to have a liquid layer beneath its icy surface.
It looks like we need to send some Canadians to these remote moons and do a little ice fishing. Although they will need a good drill and long lines because these ice coverings are believed to be many kilometres thick.
The only alien world with liquid rivers and lakes is Titan, a giant moon of Saturn, larger than our moon and the only one with an atmosphere thicker than Earth’s. This bizarre moon has been referred to as the primitive Earth in deep freeze. At more than two hundred degrees below zero, water is frozen as hard as rock, forming the rugged ground. However, at those extremely low temperatures, methane turns into a liquid, raining down and filling lakes and rivers. Methane goes through the same cycle of evaporation, condensation and precipitation as water does on Earth. One of Titan’s methane lakes is the size of Lake Superior. Organic chemicals, similar to those found on Earth before life emerged are scattered across the surface of Titan. Will it too come alive in the distant future when the sun swells into a red giant star?