Martian Ice: A Find Just a Meter Deep ⚡ экспресс
On Mars, at mid-latitudes, just a few centimeters of dry soil hide pure water ice. Recent observations show it extends to 35° latitude and has a complex structure that old models failed to reproduce. Using an improved climate model, scientists discovered: it's leftover ice that fell onto the surface when the planet's tilt was greater, then buried under dust—like an ancient snowdrift beneath a layer of sand. Modeling two ice ages (630,000 and 4.18 million years) gave burial depths of 25–150 cm and 41–255 cm. Only the younger version matched both depths and longitudinal variations, meaning the subsurface ice at mid-latitudes is less than 4 million years old.
Beneath a thin layer of red dust on Mars lies water ice. Its presence was confirmed by the Phoenix lander and orbital instruments, but the mystery remained: why is the ice always just a few centimeters below the surface?
The answer lies in the wobbles of Mars' axial tilt. When the tilt is high, water vapor from the poles falls as frost in the mid-latitudes. As the tilt decreases, the frost sublimates, leaving behind dust. A porous crust forms — a dust blanket that slows the evaporation of the remaining ice.
Climate modeling revealed: ice deposited around 630,000 years ago now sits at a depth of 25–150 cm, matching observations. The conclusion: subsurface ice is young — less than 4 million years old. Without the dust blanket, it would vanish in centuries. But the crust acts as a self-regulator: the stronger the evaporation, the thicker the protection, and the ice persists for millions of years. For colonists, this means: water is nearby, no need to dig deep.
🎯 On Mars, ice behaves like dry ice on a theater stage: it slowly evaporates, skipping the liquid phase, leaving only a dusty trail.
🎬 In the movie 'The Martian,' the hero extracts water from the soil — exactly as can be done with subsurface ice on Mars.