Rusty crust made Mars warm and wet

The Climate Puzzle of the Red Planet

Astronomers have long sought to understand how Mars, now a cold and desolate world, was once warm enough to support liquid water flowing across its surface. A new scientific proposal suggests the key to this ancient warmth may lie in chemical processes occurring beneath the planet's crust.

Subsurface Iron Oxide Processes

According to the newly proposed idea, layers of rust—or iron oxide—located below the Martian surface played a crucial role in maintaining elevated temperatures. This subsurface structure is thought to have directly influenced the planet's thermal budget and early climate stability.

Rethinking Martian Geological Evolution

This fresh perspective could alter current models of Mars's atmospheric and geological history. Future surface missions and orbital measurements will help test whether subsurface oxidation truly enabled the Red Planet to hold onto its liquid water.