Mercury ice arrived on a comet, new theory says

A recent study proposes that the icy water at Mercury's poles did not form there, but was brought by the impact of an ice-rich comet or asteroid. Protected in craters that never see direct sunlight, this ice layer would have persisted for billions of years, explaining a mystery that has puzzled astronomers since its discovery.

Mercury surface with a massive comet impact in progress, icy fragments exploding outward and raining down into deep polar craters, sunlight never reaching the shadowed crater floors where frozen water accumulates, crater rims casting sharp black shadows, grey rocky terrain with fine dust, bright white ice patches glowing inside eternal darkness, cinematic space scene, photorealistic planetary render, high contrast lighting between sunlit and dark zones, dramatic cosmic collision, detailed crater textures, scientific visualization style

How a Single Impact Could Seed the Poles with Ice 🧊

The study's authors modeled the impact of a large icy object. The simulation shows that the released material was selectively distributed, depositing only in the permanently shadowed areas of polar craters. There, the temperature does not exceed -170 °C, allowing the ice to remain stable without sublimating. This mechanism, occurring in a single event, resolves the question of how a planet so close to the Sun can harbor water deposits.

Mercury: The Planet That Ordered Ice for Its Coffee ☕

So Mercury, the world closest to the Sun and famous for frying anything at 430 °C during the day, turns out to have ice at its poles. The explanation: a kamikaze comet that stamped its icy cargo right into the dark corners. Like a cold drink delivery driver who got the address wrong and, instead of leaving them in the fridge, tossed them in the desert. But hey, the ice came to stay.