Biosignatures & Paleobiology: March 2014

When we send probes to other worlds (such as Mars) to look for evidence of past life, we are sending them to look for fossils.

A new study published recently in PNAS explores the relationship between the origin of animals and the oxygen content of the atmosphere.

How life arose from the toxic and inhospitable environment of our planet billions of years ago remains a deep mystery.

We developed an idealized two-column model to investigate the climate of tidally locked terrestrial planets with Earth-like atmospheres in the habitable zone of M-dwarf stars.

Astronomers at the University of Washington have developed a new method of gauging the atmospheric pressure of exoplanets, or worlds beyond the solar system, by looking for a certain type of molecule.