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Summary of representative locations in the Arabian Peninsula that could be employed as analog sites for astrobiological studies. Colors denote environment types (green: salt flats, dark blue: deep-sea brine pools, light blue: hydrothermal vent systems, white: snow-covered mountains and deserts, gray: volcanic fields, red: hot springs, and yellow: deserts) -- Extremophiles

Analog Studies, Away Teams & Field Reports, Biogeochemical Cycles & Geobiology, Biophysics, Biosignatures & Paleobiology, Caves, Craters, Mountains & Lava Tubes, Desert Worlds, Exploration Gear & Tech, Extremeophiles and Extreme Environments, Fossils & Paleontology, Habitable Zones, Mapping, Geodesy, Cartography, Microbiology & Virology, Sample Return

Extreme Arabian Environments And Their Microbiomes: New Frontiers For Astrobiology And Biosignature Discovery

by Keith CowingApril 13, 2026April 13, 2026

Astrobiology assesses the habitability of planetary bodies and the potential for extraterrestrial life.

Enceladus -- NASA

Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Enceladus, Habitable Zones, Origin & Evolution of Life, Water/Hycean Worlds & Oceanography

From Early Earth to Enceladus – Mineral Electrochemistry Could Drive Organic Synthesis

by Keith CowingApril 13, 2026April 13, 2026

Representative organic matter in Chang'e-6 (A–B) and Chang'e-5 (C–D) lunar soils. Secondary electron images acquired by scanning electron microscopy overlaid with carbon elemental maps from energy-dispersive spectroscopy. Credit Image by HAO Jialong's Group

Artemis & Lunar Exploration, Astrochemistry, Astrogeology, Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biophysics, Biosignatures & Paleobiology, Icy Worlds, Moon

Chang’e Mission Samples Reveal How Exogenous Organic Matter Evolves On The Moon

by Keith CowingApril 13, 2026April 13, 2026

Pressure–temperature (P–T) conditions of our experiments compared to phase diagram of the CO2–H2O system. Red dots correspond to actual P–T conditions at various stages of ice preparation. Dashed lines are only indicative and do not correspond to measured variations in pressure. Paths labeled in red, yellow, and magenta correspond to ice retaining CO2. Paths labeled in black correspond to ice devoid of CO2. Lowercase letters show the stages of the experiment described in the text, with subscripts showing the applicable experiment number. The stars near the bottom left denote the P–T conditions during acquisition of spectra. -- astro-ph.EP

Astrochemistry, Astrogeology, Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biophysics, Biosignatures & Paleobiology, Europa, Icy Worlds, Imaging & Spectroscopy

The Fate Of Frozen Carbonated Water At Europa-like Conditions

by Keith CowingApril 13, 2026April 13, 2026

Hydrogen cyanide - Wikipedia

Astrochemistry, Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biophysics, Biosignatures & Paleobiology, Habitable Zones, Origin & Evolution of Life, Water/Hycean Worlds & Oceanography

Mineral-facilitated Aqueous Synthesis Of Hydrogen Cyanide From Prebiotically Abundant Amino Acids For Chemical Evolution

by Keith CowingApril 13, 2026April 13, 2026

The mass versus orbital distance of currently discovered and characterized exoplanets. Solar system planets are indicated as well. The hexagonal icons, indicating spectroscopic characterization studied done using JWST, are adopted from Espinoza & Perrin (2025). Direct imaging, currently limited to far out and large planets, will have to advance in sensitivity and contrast ratio to reach Earth-like planets. -- astro-ph.EP

Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy

Spectral Signatures From The Habitable Zone

by Keith CowingApril 13, 2026April 13, 2026

Geometries of the H-addition reactions on HNC leading to cis- and trans-HC•NH (reactions R4-cis and R4-trans). Distances are in Å -- astro-ph.GA

Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Icy Worlds, Imaging & Spectroscopy, Interstellar

Methanimine As A Sink In The HCN And HNC Solid State Hydrogenation Network

by Keith CowingApril 13, 2026April 13, 2026

Exoplanet detection limits from the neural network framework in the case of HARPS-N solar spectra. Left: Detection limit map in the period-amplitude domain. The red dots indicate the successful detection by the trained NN with a false alarm probability (FAP) > 0.1%. Middle: Amplitude comparison between the injected and recovered signals in the period-amplitude domain. The amplitude difference for most of the recovered signals are < 20%. The large difference at low amplitude (0.1 m/s) is likely due to noise in the data. Right: Phase comparison between the injected and recovered signals in the period-amplitude domain. The phase difference for most of the recovered planets is < 0.04. The large differences at long periods is likely due to a poorer sampling of the phase for long-period planetary signals.--astro-ph.EP

AI - Data - Apps - Cybernetics, Astrobiology (general), Astrochemistry, Astrogeology, Astronomy & Telescopes, Habitable Zones, Imaging & Spectroscopy

Machine Learning As A Transformative Tool for (Exo-)Planetary Science

by Keith CowingApril 13, 2026April 13, 2026

Energetics associated with the occupancy of the K1 site and the position of the M2 ion. (A) Free energy surface of the concerted motions of Prp11 Lys10 and M2, with the initial PDB conformation marked by a yellow star. (B–D) Representative structures of three metastable states from metadynamics simulations. State 1 (B) represents a PDB-like arrangement where Lys10 (slate blue sticks) remains at the K1 site, and M2 (yellow sphere) is properly positioned at the U6 snRNA triple-helix (yellow cartoon). State 2 (C): Lys10 leaves the K1 site, allowing a K+ ion to occupy it and stabilize M2 in place. State 3 (D): M2 directly coordinates G52, losing its catalytic position and partially occupying the K1 site. -- PNAS

Astropharmacy / Biotechnology, Biochemistry & Organic Chemistry, Biophysics, Genomics, Proteomics, Bioinformatics, Nanotechnology & SynBio

Computational Chemistry And Supercomputers To Help Understand The Mechanisms Of Life

by Keith CowingApril 13, 2026April 13, 2026

Evidence for ribozyme mass extinction. (A) Abundance distribution across all ten known small self-cleaving ribozyme families, showing the hammerhead's 91% dominance, a pattern characteristic of disaster taxa following mass extinction events. (B) Circular phylogeny of 80,548 unique hammerhead sequences colored by host taxonomic group. The star-like topology is consistent with post-bottleneck radiation, and the interspersion of distantly related host phyla around the tree reflects repeated independent colonization events rather than co-speciation, consistent with horizontal transfer of a single dominant survivor lineage. (C) Null distribution tests for Tajima's D (left) and Fu's Fs (right), each based on 10,000 coalescent replicates (n = 200, S = 40). Blue and orange histograms show the null distributions under neutral expectations; red dashed lines indicate the observed values (D = +2.28, upper-tail p = 0.013; Fs = −618.0, p < 0.0001). Observed D falls in the extreme upper tail (98.7% of null replicates below observed), indicating deep hierarchical structure; observed Fs falls far below any null replicate, indicating massive haplotype excess. The discordance between positive D and extremely negative Fs is diagnostic of ancient divergence preserved through a bottleneck followed by rapid within-lineage expansion. Full-sample values (n = 5,036) are D = +3.79, Fs = −690.8. -- biorxiv.org

Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Genomics, Proteomics, Bioinformatics, Origin & Evolution of Life

A Ribozyme Mass Extinction At The RNA-cellular Boundary And Its Potential Imprint On The Genetic Code

by Keith CowingApril 13, 2026April 13, 2026