The Cassini mission to Saturn and its moons wrapped up in 2017, when the spacecraft was sent plunging into the gas giant to meet its end. But there's still a lot of data from the mission to keep scientists busy. A team of scientists working with Cassini data has made a surprising discovery: Titan's methane-filled lakes are much deeper, and weirder, than expected.
Titan is an unusual world. It's the only body, other than Earth, that has liquid on its surface. Scientists suspect that some of the solar system's other moons, like Enceladus and Europa, have liquid oceans. But those oceans are subsurface water oceans. Only Titan has lakes of liquid hydrocarbons.