PASADENA (CNS) — NASA’s Cassini spacecraft has found deep, steep-sided canyons flooded with liquid hydrocarbons on Saturn’s moon, Titan, the Jet Propulsion Laboratory, which manages the Cassini mission for NASA, announced.

The finding represents the first direct evidence of the presence of liquid-filled channels on Titan and the first observation of canyons hundreds of feet deep, JPL said in a statement. The channels are narrow canyons generally less than a mile wide and 790 to 1,870 feet deep.

The presence of such deep cuts in the landscape indicates that whatever process created them was active for a long time on Titan’s surface, the statement said.