[Icarus] Saturn’s moon Enceladus has active plumes suggestive of locally high heat fluxes at present, and the present-day heating is reasonably well characterized. However, the moon’s thermal history is not […]
astrogeology
Posted inMars
A Journey To The Depths Of Ancient Mars?
[NASA/Alex Jones] After spending the last six months exploring “Lac de Charmes,” a region of ancient rock beyond Jezero crater’s western rim, Perseverance has stumbled upon a vast field of […]
EAI seminar: “Searching for Signs of Life with ExoMars Rosalind Franklin” with Jorge Vago
BY JORGE VAGO, ESA – European Space Agency Tuesday, 13 October 2026 Finding signs of life elsewhere would constitute one of the most important scientific discoveries of our time. From […]
![Initial 𝑎c–𝑒c distribution of the 32,000 comets used in each end-to-end calculation. Dashed lines mark the semimajor axes of P7 and P8. The circular and eccentric planet calculations use identical comet initial states.-- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Planetary.png?resize=1200%2C604&ssl=1)
Posted inComets and Asteroids
Planetary Eccentricity Enhances Inward Comet Transport But Suppresses Gentle Impacts
[astro-ph.EP] Comets can supply volatile and prebiotic material to rocky planets, but survival of fragile molecules depends on atmospheric entry and impact. Compact planet chains can transfer comets inward at […]
![Illustration of the different size averages for Renazzo (after the data of Ebel et al. (2024)) on a back-scattered electron image of polished section 719sp3 of the Muséum national d’Histoire naturelle collection (Jacquet et al., 2012).-- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Chondrule.png?resize=1200%2C720&ssl=1)
Posted inAstrogeology
Chondrule Size Averaging In Two And Three Dimensions
[astro-ph.EP] Chondrule sizes are an important discriminant of chondrite groups and chondrule formation theories. Yet most studies report 2D sizes without attempting the somewhat tedious corrections to 3D proposed in […]
Posted inMars
Sulfate Deposits On Iani Chaos On Mars
[NASA/JPL-Caltech/UArizona] This HiRISE image shows light-toned layered deposits within Iani Chaos. Many of the same deposits occur within the depressions of Iani Chaos, as well as several nearby similar regions […]
![Final semi-major axes and masses for all objects produced in simulations with regular disks. The left panel shows objects produced in disks with low C/O ratios and the right one shows planets in high C/O ratio disks. The dash-dotted line shows the initial mass of planestesimals in our simulations while the dotted line shows the initial mass of planetary embryos. We consider planets to be anything at or above the initial embryo mass, fragments to be anything below the initial planetesimal mass, and planetesimals to be any object at or above the initial planetesimal mass but below the initial embryo mass. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Correlations.png?resize=1200%2C719&ssl=1)
Posted inExoplanets, -moons, -comets
Correlations Between The Carbon-to-Oxygen Ratio and the Orbital and Physical Properties of Exoplanets
[astro-ph.EP] Studies suggest that protoplanetary disks around stars with high carbon-to-oxygen (C/O) ratios can produce terrestrial planets with carbon-dominated compositions instead of silicon-dominated ones.
![Chemical clock relations for planet-hosting solar analogs, showing abundance ratios as a function of stellar age for [Y/Mg], [Y/Al], [Ba/Mg], [Ba/Al], [Sr/Mg], and [Y/(Mg+Al)/2]. Data points are color-coded by metallicity ([Fe/H]). Black lines show best-fit linear relations derived using Deming regression, accounting for uncertainties in both variables, and shaded regions indicate 1σ confidence intervals. All abundance ratios show statistically significant correlations with stellar age. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Planets-Around.png?resize=1200%2C720&ssl=1)
Posted inExoplanets, -moons, -comets
Planets Around Solar Twins/Analogs (PASTA) III: Chemical Clock Relations in Planet-Hosting Solar Analogs
[astro-ph.EP] Context. Abundance ratios between elements synthesized on different nucleosynthetic timescales provide empirical chemical clocks for estimating stellar ages, but robust calibrations require homogeneous samples with precise stellar parameters and […]
Posted inMars
Following Ancient Rain Toward The Origins Of Life On Mars
[Tohoku University] The Mars we know today is a cold, dry world of dust and rocks. However, around 3.8-3.6 billion years ago, it may have looked very different. Geological and […]
Posted inTitan
Flow Dynamics Of Cryolava Or Impact Melt On Titan’s surface
[astro-ph.EP] Titan, a unique body in the solar system, resembles a life-size Miller-Urey experiment where pockets of liquid water might interact with abundant organic matter.