The nature of the early martian climate is one of the major unanswered questions of
planetary science. Key challenges remain, but a new wave of orbital and in situ observations …

Abstract The Sample Analysis at Mars (SAM) investigation of the Mars Science Laboratory
(MSL) addresses the chemical and isotopic composition of the atmosphere and volatiles …

Reconciling the geology of Mars with models of atmospheric evolution remains a major
challenge. Martian geology is characterized by past evidence for episodic surface liquid …

We discuss 3D global simulations of the early martian climate that we have performed
assuming a faint young Sun and denser CO2 atmosphere. We include a self-consistent …

On the basis of geological evidence, it is often stated that the early martian climate was
warm enough for liquid water to flow on the surface thanks to the greenhouse effect of a thick …

The presence of valleys on ancient terrains of Mars suggests that liquid water flowed on the
martian surface 3.8 Gyr ago or before. The above-freezing temperatures required to explain …

The climate of early Mars remains a topic of intense debate. Ancient terrains preserve
landscapes consistent with stream channels, lake basins and possibly even oceans, and …

Early Mars climate research has well-defined goals (MEPAG 2018). Achieving these goals
requires geologists and climate modelers to coordinate. Coordination is easier if results are …

We present a comprehensive photochemistry model for exploration of the chemical
composition of terrestrial exoplanet atmospheres. The photochemistry model is designed …

The widespread evidence for liquid water on the surface of early Mars is difficult to reconcile
with a dimmer early Sun. Many geomorphological features suggestive of aqueous activity …