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Contributions to the peak 𝑃𝑅 from the bow shock and magnetopause at 𝜂 = 5.38018 × 108cm2s−1 for Case #1 (panel a), Case #2 (top of panel b), and Case #3 (bottom of panel b). The volumetric renderings show ∇ · Stotal in erg cm−3 s−1. -- astro-ph.EP

Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Habitable Zones, Magnetic Fields, Electromagnetism, bioelectricity,, Space Weather & Heliophysics, TRAPPIST-1

Resistive MHD Simulations of Stellar Wind-Magnetosphere Coupling in TRAPPIST-1e

by Keith CowingApril 2, 2026April 2, 2026

Close-in terrestrial exoplanets around M dwarfs reside in dense, magnetized winds, where non-ideal plasma coupling can strongly affect how electromagnetic energy is redistributed within the dayside interaction region.

Evolution of the stellar mass-loss rate (𝑀̇ w) and wind velocity (𝑣w) obtained from our 2 M⊙ stellar model. The left panels show the complete evolution of 𝑀̇w and 𝑣w through the RGB to the TPAGB phases, while the right panels focus specifically on the TPAGB evolutionary phase. -- astro-ph.EP

Astrogeology, Exoplanets, -moons, -comets, Space Weather & Heliophysics, Stellar Cartography

Wind Accretion Onto Planets Orbiting An Evolving Solar-like Star And Their Detectability

by Keith CowingMarch 21, 2026March 21, 2026

Different celestial objects and acceleration Credit Jani Närhi

Exoplanets, -moons, -comets, Habitable Zones, Radiation, Space Weather & Heliophysics

New Model Defines An Upper Limit To Planetary Radiation Belt Intensity

by Keith CowingMarch 11, 2026March 11, 2026

Spectra of NEOs with (potential) 3 μm absorption features. (A) Spectrum of (161989) Cacus as observed on 2022 September 3 and 4. (B) (756998) 2024 CR9 as observed on 2024 June 9. (C) 1998 HH 49 as observed on 2023 October 19. (D) 2006 WB as observed on 2024 November 27. The blue points represent the reflectance spectra (thermal component removed) and the red dashed lines are the reflected continua. -- The Planetary Science Journal via X-mol.net

Astrochemistry, Astrogeology, Biosignatures & Paleobiology, Comets and Asteroids, Imaging & Spectroscopy, Mapping, Geodesy, Cartography, Meteorites & Asteroids, Space Weather & Heliophysics

Hydration Features on Near-Earth Objects: Integrating New Data with Prior Results

by Keith CowingMarch 10, 2026March 10, 2026

How ESA's Mars orbiters make use of radio occultation -- ESA

Atmospheres, Climate, Weather, Habitable Zones, Mars, Radiation, Space Weather & Heliophysics

ESA Orbiters Watch A Solar Superstorm Hit Mars

by Keith CowingMarch 6, 2026March 6, 2026

Time series of the S -index for GJ 617A. Each point represents a SOPHIE spectrum. -- astro-ph.SR

Astronomy & Telescopes, Exoplanets, -moons, -comets, Habitable Zones, Space Weather & Heliophysics, Stellar Cartography

Long-term Activity Cycles In Planetary M Stars Observed With SOPHIE

by Keith CowingMarch 6, 2026March 6, 2026

Left panel: schematic of an extraterrestrial transmitter on a planet (green) within the Exo-IPM, with Rimp indicating the impact distance of the passing line of sight between Earth and the ETI transmitter from the stellar object (orange). Right panel: simplified thin-screen representation of phase perturbations in a narrowband monochromatic wave propagating through a turbulent medium, showing Doppler-shifted frequencies. Temporal variations in these perturbations lead to spectral broadening of the transmitted signal. -- The Astrophysical Journal

Astronomy & Telescopes, Biosignatures & Paleobiology, SETI & Technosignatures, Space Weather & Heliophysics

Why SETI Might Have Been Missing Alien Signals

by Keith CowingMarch 5, 2026March 5, 2026

Two-dimensional wireframe representation of the atmospheric geometry implemented in the Geant4 simulations. The model consists of four concentric spherical layers corresponding to the altitude ranges 15–20 km, 20–25 km, 25–30 km, and 30–35 km, surrounding the Earth’s surface. -- astro-ph.HE

Astrochemistry, Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Gaia - Planetary Perspectives, Habitable Zones, Radiation, Space Weather & Heliophysics

Energy Deposition By Galactic Cosmic Rays And Implications For Ozone Chemistry

by Keith CowingMarch 2, 2026March 2, 2026

ultraviolet aurorae on Ganymede ©️ NASA/JPL-Caltech/SwRI/UVS/ULiège/Gusbin/Bonfond

Ganymede, Jupiter, Magnetic Fields, Electromagnetism, bioelectricity,, Radiation, Space Weather & Heliophysics

Similarities Between Auroras On Ganymede And Earth

by Keith CowingFebruary 25, 2026February 25, 2026

Illustration of some of the multi-modal factors that may contribute to an IHZ in our solar system, overlaid on traditional habitable zones: the circumstellar habitable zone and the zone where closed icy ocean worlds can exist. -- astro-ph.EP

Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Radiation, Space Weather & Heliophysics, TRAPPIST-1

The Interplanetary Habitable Zone

by Keith CowingFebruary 17, 2026February 17, 2026