Cassini-Huygens
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Cassini spacecraft finds flooded canyons on Saturn's moon Titan
It's official: Saturn's largest moon, Titan, has canyons that are flooded with liquid. Well, liquid hydrocarbons, anyway: Scientists analyzed images from a flyby of the Ligeia Mare sea of methane that the spacecraft did in 2013 and found channels branching out from it. Some of these were narrow and deep but it wasn't until further examination that they confirmed the steep troughs were carved out by liquid.
