Titan, one of Saturn's moons, was explored by NASA's Cassini. The result was canyons of liquid hydrocarbons. Obviously, any mention of liquid is a big deal in the space community, but Titan's canyons are also the deepest discovered canyons on the moon. Titan is much colder than the Earth and it's moon.

Source: http://phys.org/news/2016-08-cassini-canyons-titan.html