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There is growing evidence suggesting the presence of aqueous environment onancient Mars, raising the question of the possibility of life in such anenvironment. Subsequently, with the erosion of the Martian atmosphere resultingin drastic changes in its climate, surface water disappeared, shrinkinghabitable spaces on the planet, with only a limited amount of water remainingnear the surface in form of brines and water-ice deposits. Life, if it everexisted, would have had to adapt to harsh modern conditions, which includes lowtemperatures and surface pressure, and high radiation dose. Presently, there isno evidence of any biological activity on the planet's surface, however, thesubsurface environment, which is yet to be explored, is less harsh, has tracesof water in form of water-ice and brines, and undergoes radiation-driven redoxchemistry. I hypothesize that Galactic Cosmic Ray (GCR)-inducedradiation-driven chemical disequilibrium can be used for metabolic energy byextant life, and host organisms using mechanisms seen in similar chemical andradiation environments on Earth. I propose a GCR-induced radiolytic zone, anddiscuss the prospects of finding such life with Rosalind Franklin rover of theExoMars mission.

Investigating the biological potential of galactic cosmic ray-induced radiation-driven chemical disequilibrium in the Martian subsurface environment