The atmosphere of the Archean eon—one-third of Earth's history—is important for
understanding the evolution of our planet and Earth-like exoplanets. New geological proxies …

How and where did life on Earth originate? To date, various environments have been
proposed as plausible sites for the origin of life. However, discussions have focused on a …

The second ExoMars mission will be launched in 2020 to target an ancient location
interpreted to have strong potential for past habitability and for preserving physical and …

The ancestors of cyanobacteria generated Earth's first biogenic molecular oxygen, but how
they dealt with oxidative stress remains unconstrained. Here we investigate when …

Habitability is a widely used word in the geoscience, planetary science, and astrobiology
literature, but what does it mean? In this review on habitability, we define it as the ability of …

The origin of life on Earth seems to demand a highly reduced early atmosphere, rich in CH
4, H 2, and NH 3, but geological evidence suggests that Earth's mantle has always been …

Each recent report of liquid water existing elsewhere in the Solar System has reverberated
through the international press and excited the imagination of humankind. Why? Because in …

This article presents a current (as of September 2019) list of recommended ages for proven
terrestrial impact structures (n= 200) and deposits (n= 46) sourced from the primary …

The conditions, timing, and setting for the origin of life on Earth and whether life exists
elsewhere in our solar system and beyond represent some of the most fundamental …

Ideas about atmospheric composition and climate on the early Earth have evolved
considerably over the last 30 years, but many uncertainties still remain. It is generally agreed …