Despite being pivotal to the habitability of our planet, the process by which Earth gained its present-day hydrogen budget is unclear.
The HWO Science Working Groups are excited to share draft science cases that will help shape the top-level science goals, instrument needs, and mission architecture for the Habitable Worlds Observatory […]
![Distribution of simulated EEC yield (solid contours) and underlying planet population (dotted contours) around FGK-type stars within 20 pc. We show the planetary radius over incident flux distribution, where the color shading represents the relative density of planet occurrences in this parameter space. The colored contours enclose 10% to 100% of the total planet counts, with the innermost contour indicating the highest-density regions. Grey dashed lines represent EEC boundaries around a Sun-like star with S/S⊕ ∈ [0.356, 1.107] and R/R⊕ ∈ [0.8 · S 0.25, 1.4] (Kopparapu et al. 2014; Stark et al. 2019; Quanz et al. 2022b). Top and right margin plots show the individual distributions of incident flux and planetary radius of detected and total underlying populations. Underlying synthetic planet populations are based on Kammerer et al. (2022). -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2025/06/Detecting-Atmospheric-CO2-Trends1.png?resize=1200%2C720&ssl=1)
Identifying key observables is essential for enhancing our knowledge of exoplanet habitability and biospheres, as well as improving future mission capabilities.
Future missions to icy ocean worlds (OW) such as Europa and Enceladus will evaluate the habitability and potential for biosignatures on these worlds.
As stars evolve to higher luminosities during first ascension of the giant branch, previously frozen terrestrial worlds may thaw and host liquid water on their surfaces.
The James Webb Space Telescope (JWST) has started a revolution in exoplanetary science.
The relative abundances of exotic environments provides us with (uninformed) bounds on the habitability of those environments relative to our own, on the basis that our presence here is not […]
We investigate the impact of CO2 on TRAPPIST-1 e, f and g during the magma ocean stage. These potentially habitable rocky planets are currently the most accessible for astronomical observations.
IMAGE Caption: Sketch showing processes leading to larger H-loss in the past 20 million years (Myr). The loss rate is not expected to have been constant with time, and may […]
Scientists at Yale and in Singapore have devised what may be the ultimate acid test — a comprehensive model for estimating the origins of Earth’s habitability, based in part on […]
