This artist’s concept of a lake at the North Pole of Titan shows the raised features that inspired the theory that exploding pockets of liquid nitrogen may be forming craters, which become lake basins.
(Credit: NASA/JPL-Caltech)

Saturn’s moon Titan is a distant and frigid world, but it also carries intriguing similarities to Earth’s own terrain. Liquid lakes and seas dot its landscape, though the methane and ethane that fill them are a far cry from terrestrial water. Now a new theory suggest