Saturn's moon Titan has rivers of liquid methane longer than the Nile's tributaries, but a 2025 Brown University study found that only 1.3% of those rivers form deltas — on Earth, nearly every river does, and nobody yet knows why Titan's don't

Saturn's moon Titan has rivers of liquid methane longer than the Nile's tributaries, but a 2025 Brown University study found that only 1.3% of those rivers form deltas — on Earth, nearly every river does, and nobody yet knows why Titan's don't

There is a 400-kilometre river system near the north pole of Titan that drains into a sea larger than Lake Superior. That sentence sounds almost ordinary until you change the materials. The river is probably carrying methane mixed with ethane. The land around it is largely water ice, frozen so hard that it plays the role of rock. The sea is Ligeia Mare, one of the great hydrocarbon reservoirs hidden beneath Titan’s orange haze. NASA called this …