Our understanding of Earth's rock-hosted subsurface biosphere has advanced over the past
two decades through the collection and analysis of fluids and rocks from aquifers within the …

Here we review published studies on the abundance and diversity of terrestrial rock-hosted
life, the environments it inhabits, the evolution of its metabolisms, and its fossil biomarkers to …

The biogeochemical redox processes of iron can influence iron mineralization, contaminant
transformation and the fate of nutrients. Fe (II) can be chemically/biologically oxidized by O2 …

Microbial activity is a major contributor to the biogeochemical cycles that make up the life
support system of planet Earth. A 613 m deep geomicrobiological perforation and a …

The transition of the martian climate from the wet Noachian era to the dry Hesperian (4.1–3.0
Gya) likely resulted in saline surface waters that were rich in sulfur species. Terrestrial …

Although the habitability of early Mars is now well established, its suitability for conditions
favorable to an independent origin of life (OoL) has been less certain. With continued …

The search for life beyond Earth has focused on Mars and the icy moons Europa and
Enceladus, all of which are considered a safe haven for life due to evidence of current or …

Curiosity, the Mars Science Laboratory (MSL) rover, landed on Mars in August 2012 to
investigate the~ 3.5-billion-year-old (Ga) fluvio-lacustrine sedimentary deposits of Aeolis …

Coupled reaction of Fe (II) oxidation and nitrate reduction plays an important role in
biogeochemical cycling of Fe and N, but biologically redox-inert clay minerals are seldom …

Oxychlorine species are globally widespread across the Martian surface. Despite their
ubiquitous presence, the ability of oxychlorine species to serve as oxidants on Mars has …