Nitrogen (N) plays a crucial role in controlling biological productivity. However, it remains unknown how Earth’s earliest ecosystems accessed bioavailable forms of nitrogen.
atmosphere
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
Building a Roadmap for Hubble Science into the 2030s: Revealing Atmospheric Structure and Evolution in Substellar Worlds Using HST
Substellar objects occupy a unique place in our universe, bridging the gap between the smallest stars and the largest planets, and serving as powerful laboratories for understanding extrasolar atmospheric physics […]
Posted inBiosignatures & Paleobiology, Fossils & Paleontology, Habitable Zones, Mars, Origin & Evolution of Life, Press Release, Tricorders & Sensors
Mars Mission: A Stress Test For The Search For Life
Billions of years ago, environmental conditions on Mars were significantly more hospitable than they are today. Our neighbouring planet was likely warm, humid, and surrounded by a dense atmosphere.
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
JWST-TST High Contrast: First Direct Spectroscopy of GJ 504 b Reveals Clouds And Possible Metal Enrichment
Characterizing the coldest directly imaged companions through direct spectroscopy has only recently become possible with the James Webb Space Telescope.
![[LEFT] Haze mass mixing ratio, q1 [g g−1 ] (left column), and haze particle size , rh [nm] (right column), for the short formation timescale simulation at 10−5 bar (top row), 10−4 bar (second row), 10−3 bar (third row) and 10−2 bar (bottom row) pressure levels. The sub-stellar point is located at (0◦, 0◦). {RIGHT} same as LEFT but for the long haze formation timescale. -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/06/Three-dimensional.png?resize=1200%2C720&ssl=1)
Posted inAtmospheres, Climate, Weather, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
Three Dimensional Temporal Evolution Of Photochemical Haze In Exoplanet Atmospheres I. Description And Test Application To HD 189733b
The formation and global spatial distribution of photochemically produced haze particles remain a key process in exoplanet atmospheres for understanding their observed properties. We aim to develop a flexible haze […]
Posted inAtmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Gaia - Planetary Perspectives, Habitable Zones, Status Report, Water/Hycean Worlds & Oceanography
ThousandWorlds: A Benchmark For Climate Emulation Of Potentially Habitable Exoplanets
The search for life beyond Earth will depend on detecting faint signatures in the atmospheres of potentially habitable exoplanets.
Posted inAtmospheres, Climate, Weather, Exoplanets, -moons, -comets, Status Report
Effect Of Tidal Gravity And Planetary Rotation On The Retrieved Atmospheric Abundances Of Close-in Exoplanets
Most modern atmospheric retrievals adopt the simplifying assumption that the planetary atmosphere endures no planetary rotation and stellar tidal effect.
Posted inAtmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biophysics, Biosignatures & Paleobiology, Extremeophiles and Extreme Environments, Genomics, Proteomics, Bioinformatics, Habitable Zones, Microbiology & Virology, Status Report, Venus
Acidophilic Fungi As Possible Candidates For Living Forms In Venus’ Clouds
Present-day Venus, similar to Earth in terms of relative radius, acceleration of gravity and mean density, is characterised by a very strong greenhouse effect and full cloud cover.
Posted inAstrogeology, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Desert Worlds, Exoplanets, -moons, -comets, Habitable Zones, Icy Worlds, Mars, Status Report
Coupling Dynamical Accretion And Chemical Differentiation: A Unified Framework For Earth-Mars Diversity
The distinct physical and geochemical differences between Earth and Mars provide fundamental constraints on terrestrial planet formation, yet a self-consistent framework linking dynamical and chemical aspects remains elusive.
Posted inAstrogeology, Conferences and Meetings, Habitable Zones, Status Report, Terraforming & Geoengineering, Venus, Video, Audio, Webcasts, Podcasts
EAI Seminar: Towards Understanding The Geological Evolution Of Venus
The next EAI Seminar 16 June May 2026 16:00 CEST (UTC + 02:00): Julia Maia, Archive Support Scientist, Telespazio UK for ESA