In the coming years and decades, advanced space-and ground-based observatories will
allow an unprecedented opportunity to probe the atmospheres and surfaces of potentially …

We describe how environmental context can help determine whether oxygen (O2) detected
in extrasolar planetary observations is more likely to have a biological source. Here we …

The collisions between two oxygen molecules give rise to O4 absorption in the Earth
atmosphere. O4 absorption is relevant to atmospheric transmission and Earth's radiation …

The TRAPPIST-1 planetary system provides an unprecedented opportunity to study
terrestrial exoplanet evolution with the James Webb Space Telescope (JWST) and ground …

Oxygenic photosynthesis is Earth's dominant metabolism, having evolved to harvest the
largest expected energy source at the surface of most terrestrial habitable zone planets …

Proxima Centauri b provides an unprecedented opportunity to understand the evolution and
nature of terrestrial planets orbiting M dwarfs. Although Proxima Cen b orbits within its star's …

Abstract Knowledge about Rayleigh scattering cross sections is relevant to predictions about
radiative transfer in the atmosphere, and needed to calibrate the reflectivity of mirrors that …

In the last three decades, knowledge of planetary systems other than our own has increased
rapidly with the discovery of over 5,000 exoplanets (Christiansen 2022). These worlds vary …

ABSTRACT O 2 and O 3 have been long considered the most robust individual biosignature
gases in a planetary atmosphere, yet multiple mechanisms that may produce them in the …

Abstract The Atmospheric Chemistry Experiment (ACE), also called SCISAT, is a Canadian-
led small satellite mission for remote sensing of the Earth's atmosphere. ACE was launched …