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 …

The Martian surface is cold, dry, exposed to biologically harmful radiation and apparently
barren today. Nevertheless, there is clear geological evidence for warmer, wetter intervals in …

Uncovers the Key Role Microbes Play in the Transformation of Oxidizable and Reducible
MineralsMany areas of geomicrobial processes are receiving serious attention from …

Return of samples from the surface of Mars has been a goal of the international Mars
science community for many years. Affirmation by NASA and ESA of the importance of Mars …

The fate of carbon (C) contained within permafrost in boreal forest environments is an
important consideration for the current and future carbon cycle as soils warm in northern …

Most ecosystems on Earth exist in permanent darkness, one or more steps removed from the
light-driven surface world. This collection of dark habitats is the most poorly understood on …

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 …

Thawing of permafrost soils is expected to stimulate microbial decomposition and respiration
of sequestered carbon. This could, in turn, increase atmospheric concentrations of …

Microbial life in the nutrient-limited and low-permeability continental crystalline crust is
abundant but remains relatively unexplored. Using high-throughput sequencing to assess …

In the last three decades we have learned a great deal about microbes in subsurface
environments. Once, these habitats were rarely examined, perhaps because so much of the …