![Instantaneous zonally-averaged vertical cross-section of H2S (left) and HS (right). The black contour on the left panel corresponds to the bottom and top altitudes of the clouds (Ignatiev et al., 2009; Titov et al., 2018).-- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/The-impact.png?resize=1200%2C560&ssl=1)
[astro-ph.EP] Venus is home to vivid sulfur chemistry, with SO2 as the major sulfur gas species and a global cloud layer between 47 and~70 km composed of H2SO4 and H2O. […]
Astrogeology
Posted inAstrogeology
JWST/MIRI Observations of Amorphous Silicates In Interstellar Comet 3I/ATLAS
[astro-ph.EP] We present JWST/MIRI Low Resolution Spectroscopy (LRS) of 3I/ATLAS obtained post-perihelion at a heliocentric distance of 2.21 au.
Posted inLava / magma ocean / Volcanic Worlds
Shiny Lava Planet Challenges Astronomers’ Expectations
[University of Birmingham] Astronomers have discovered that a rocky lava planet once thought to be too extreme to have any atmosphere appears to be wrapped in a reflective layer of […]
Posted inComets and Asteroids
Webb Space Telescope Used To Compare Interstellar Comet 3I/ATLAS With Icy Bodies In Our Solar System
[SwRI] A Southwest Research Institute-led study used NASA’s James Webb Space Telescope to examine ice grains streaming from interstellar comet 3I/ATLAS, just the third object from beyond our solar system […]
![Elevation map (km) and 10 m-wind vectors at midday (left) and sunflower wind chart over one Titan Day at the red dot location (right).-- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Mesoscale.png?resize=1200%2C720&ssl=1)
Posted inTitan
Mesoscale Modelling Of Titan’s Shangri-La region: The Impact Of Surface Properties On Winds
[astro-ph.EP] The knowledge of Titan’s near-surface atmosphere is sparse. The Huygens descent probe measured winds, and the multiple dune field observations and possible dust storms suggest active near-surface dynamics.
![Model SED calculations for Ceres (left), Eros (middle), and Hektor (right). For each target, the top panel (a) shows the predicted flux density at each epoch, while the bottom panel (b) shows the corresponding flux ratio between reflected and thermal radiation. The color coding represents heliocentric distance. The vertical dashed lines indicate the wavelength where the reflected and thermal flux contributions are equal. Alt text: Modeled spectral energy distributions of Ceres, Eros, and Hektor showing reflected and thermal emission contributions. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Spectroscopic.png?resize=1200%2C725&ssl=1)
Posted inAriel Mission
Spectroscopic Survey of Small Solar System Bodies with Ariel
[astro-ph.EP]. The small Solar System bodies (SSSBs) preserve records of the formation and evolution of the Solar System. In particular, the near-infrared wavelength region around 3 μm provides crucial insights […]
![Global map of Enceladus with color and contours indicating the estimated heat flux (in mWm−2 ) calculated from maps of shell thickness [Hemingway and Mittal, 2019]. Our results (Table 1) are plotted as lines using the same color scale as the background. Green labeled boxes show other estimates [Giese et al., 2008; Bland et al., 2012, 2007; Leonard et al., 2021] of paleo-heat fluxes using similar methods.-- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Paleoheat.png?resize=1200%2C721&ssl=1)
Posted inEnceladus
Paleo-heat Flux Estimates Across Enceladus Derived From Flexural Response Of The Ice Shell
[astro-ph.EP] 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 […]
![Illustration of the spatial distribution and proposed origin of the molecular species discussed in this work, including the tentative FeS emission. Left: H2O v2 = 1 and NaCl emission maps toward Orion SrcI reported by A. Ginsburg et al. (2018). Right: schematic view of the proposed distinction between species associated with the outflow and those tracing the disk midplane, based on the results presented here (Table 1) and those of A. Ginsburg et al. (2018, 2019). -- [astro-ph.GA]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Tentative-Detection.png?resize=1200%2C719&ssl=1)
Posted inAstrochemistry
Tentative Detection of FeS toward Orion SrcI
[astro-ph.GA] Iron sulfide (FeS) is a key refractory compound in astrophysical environments. It is commonly found in meteorites and evidence of FeS has only been reported in solid form in […]
Posted inIcy Worlds
Isobaric Crystallization of Aqueous Magnesium Chloride Solutions at Icy Moon Conditions
[ACS] Subsurface oceans inside icy moons are expected to contain dissolved salts whose crystallization controls the mineralogy of their hydrospheres and potentially their surfaces.
Posted inInterstellar
Assessment Of The Mass Loss And Radius Change Of 3I/ATLAS Based On Observed Production Rates
[astro-ph.EP] Formed from the debris of planet formation, interstellar comets provide invaluable insights into the chemical compositions of planetary systems outside of our Solar System.