Titan's methane rivers defy Earth logic: Why 98.7% lack deltas

A billion kilometers from the Sun, on a moon where methane rains from orange skies and rivers carve channels through mountains of frozen water, scientists have discovered that the familiar logic of rivers does not hold. A 2025 Brown University study found that only 1.3 percent of Titan's methane rivers — some longer than Earth's greatest tributaries — form deltas where they meet the sea, defying one of the most reliable patterns in planetary hydrology. The absence invites a deeper question: how much of what we call universal law is merely local habit, written by water on one small world?