![Atmospheric energy deposition profiles of GCRs and SEPs in the atmosphere of K2-18b for different magnetic field strengths. The profiles have been smoothed to improve visual clarity. For visibility, the deposited energy corresponding to B=300 µT has been multiplied by a factor of 10. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/09/Energy-.png?resize=1200%2C718&ssl=1)
[astro-ph.EP] Cosmic rays can significantly alter the abundances of certain species in the upper layers of planetary atmospheres, especially in terms of their biosignatures. To fully understand the extent of […]
Cosmic Rays
Posted inAstrochemistry, Astrogeology, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
Metamorphoses Of Carbon And Oxygen In Protoplanetary Discs: How Chemistry And Radial Drift Transform Inner Disc C/O Ratios
The chemical composition of a protoplanetary disc is sensitive to its thermal structure and dust properties, and can provide insights into the disc evolution.
![Simulation results of abundance ratios [H2O2]/[H2O] (black lines), [H2]/[H2O] (orange lines), and [O2]/[H2O] (blue lines) with our model (model A) at 16 K (solid lines) and 77 K (dashed lines). The gray shaded and line filled regions show the experimental results of [H2O2]/[H2O] by Gomis et al. (2004a) at 16 and 77 K, respectively, with an assumed uncertainty of a factor of 3. -- astro-ph.GA](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/02/Simulation-of-proton-radiolysis.png?resize=1200%2C719&ssl=1)
Posted inAI - Data - Apps - Cybernetics, Astrochemistry, Astrogeology, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Icy Worlds, Imaging & Spectroscopy, Interstellar, Status Report
Simulation Of Proton Radiolysis Of H2O And O2 Ices With The Nautilus Code
The radiolysis effect of cosmic rays (CRs) plays an important role in the chemistry in molecular clouds. CRs can dissociate the molecules on dust grains, producing reactive suprathermal species and […]
Posted inBiogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Habitable Zones, Mapping, Geodesy, Cartography, Bathymetry, Mars, Missions & Hardware, Radiation, Robotics/Rovers/UAVs, Sample Return, Status Report
Recent Production Rates Of Cosmogenic Nuclides In The Igneous Rocks of Jezero Crater Floor, Mars
The Perseverance rover has collected rock samples from the floor of Jezero crater, Mars, set to be returned to Earth through the Mars Sample Return (MSR) mission. These surface rocks […]
Posted inAstrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Imaging & Spectroscopy, Interstellar, Status Report
What Drives The Formation Of Unsaturated Molecules In The Interstellar Medium?
We present a computational investigation into the fragmentation pathways of ethanolamine (C2H7NO, EtA), propanol (C3H8O, PrO), butanenitrile (C4H7N, BuN), and glycolamide (C2H5NO2, GlA)—saturated organic molecules detected in the interstellar medium […]
Posted inHabitable Zones, Magnetic Fields, Electromagnetism, bioelectricity,, Radiation, Space Weather & Heliophysics, Status Report
Space Weather Forecasts: Monitoring The Daily Variation of Sun-Earth Magnetic Fields Using Galactic Cosmic Rays
The interplanetary magnetic field (IMF) between the Sun and Earth is an extension of the solar magnetic field carried by the solar wind into interplanetary space.
Posted inAstrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Imaging & Spectroscopy, Interstellar, Status Report, Stellar Cartography
Astrochemistry On Galactic Scales
The increasing number of observations towards different environments in the Milky Way, as well as theoretical and experimental works, are improving our knowledge of the astrochemical processes in the interstellar […]
Posted inAstrogeology, Astronomy & Telescopes, Biosignatures & Paleobiology, Gaia - Planetary Perspectives, Habitable Zones, Magnetic Fields, Electromagnetism, bioelectricity,, Press Release, Radiation, Space Weather & Heliophysics
Cosmic Rays Streamed Through Earth’s Atmosphere 41,000 Years Ago
Earth’s magnetic field cocoons our planet from the onslaught of cosmic radiation streaming through space while also shielding us from charged particles hurled outward by the sun. But the geomagnetic […]
Posted inAtmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Fossils & Paleontology, Microbiology & Virology, Origin & Evolution of Life, Status Report, Stellar Cartography, Water/Hycean Worlds & Oceanography
Cosmic Radiation Drives Quasi-periodic Changes In The Diversity Of Siliceous Marine Microplankton
Radiolarians are significant contributors to the oceanic primary productivity and the global silica cycle in the last 500 Myr. Their diversity throughout the Phanerozoic shows periodic fluctuations.
Posted inAstronomy & Telescopes, Extinction events, Radiation, Status Report
Could A Kilonova Kill: A Threat Assessment
Binary neutron star mergers (BNS) produce high-energy emissions from several physically different sources, including a gamma-ray burst (GRB) and its afterglow, a kilonova, and, at late times, a remnant many […]