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Groundwater activity on Mars and implications for a deep biosphere

Michalski, Joseph R.; Niles, Paul B.; Cuadros, Javier +3 more

By the time eukaryotic life or photosynthesis evolved on Earth, the martian surface had become extremely inhospitable, but the subsurface of Mars could potentially have contained a vast microbial biosphere. Crustal fluids may have welled up from the subsurface to alter and cement surface sediments, potentially preserving clues to subsurface habita…

Transport-driven formation of a polar ozone layer on Mars

Montmessin, Franck; Lefèvre, Franck

Since the seasonal and spatial distribution of ozone on Mars was detected by the ultraviolet spectrometer onboard the spacecraft Mariner 7, our understanding has evolved considerably thanks to parallel efforts in observations and modelling. At low-to-mid latitudes, martian ozone is distributed vertically in two main layers, a near-surface layer an…