October 2025 – Page 3 – My WordPress Site

Regime diagram showing four distinct climate regimes, according to our semi-analytical model. The solid blue line represents the instellation above which an atmosphere enters an inhibited state, dashed lines represent the instellation below which an atmosphere becomes fully convective (green versus brown assumes the atmosphere above the inhibition layer follows a moist versus dry adiabat). Arrows indicate the direction of transition. In the lower left of parameter space, atmospheres are convective (blue), in the upper right they are inhibited (red); note, atmospheres in the inhibited regime additionally show multistability (see Section 4). Between the convective and the inhibited regimes, thicker atmospheres are bistable (light and dark yellow) and thinner atmospheres oscillate (light and dark green). All parameters used in the semi-analytical model are listed in Table 1. -- astro-ph.EP

Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Water/Hycean Worlds & Oceanography

Bistability, Oscillations, And Multistability On Hycean Planets

by Keith CowingOctober 29, 2025October 29, 2025

System architectures and HZ boundaries for the Gaia-4 (left) and Gaia-5 (right) systems, showing the orbit of the planet in each case. The HZ regions are shown in green, where light green and dark green indicate the CHZ and OHZ, respectively. The scale of the figure panels are 2.5 AU and 1.5 AU along each side for Gaia-4 and Gaia-5, respectively. -- astro-ph.EP

Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy

The Dynamical Environment Within The Habitable Zone Of The Gaia-4 And Gaia-5 Planetary Systems

by Keith CowingOctober 29, 2025October 29, 2025

Extraterrestrial Materials Academy (ETMA)

Analog Studies, Astrogeology, Career Opportunities, Courses, Education and Outreach, Missions & Hardware, Planetary Protection & Biosafety, Robotics/Rovers/UAVs, Sample Return

Extraterrestrial Materials Academy (ETMA)

by Keith CowingOctober 29, 2025October 29, 2025

This graph displays data collected by NASA's Perseverance Mars rover from targets in a rock formation nicknamed "Bright Angel." Scientists later determined one of those targets, a rock nicknamed "Cheyava Falls" (second line from the top), contained a potential biosignature. -- NASA

Biosignatures & Paleobiology, Mars, Missions & Hardware, Robotics/Rovers/UAVs, Sample Return

Mars Perseverance’s SHERLOC Finds Organic Molecules in Bright Angel

by Keith CowingOctober 29, 2025October 29, 2025

SETI Institute / NVIDIA IGX Thor

AI - Data - Apps - Cybernetics, Astronomy & Telescopes, SETI & Technosignatures

SETI Institute Accelerates the Search for Life Beyond Earth with NVIDIA IGX Thor

by Keith CowingOctober 28, 2025October 29, 2025

The size of GJ 251 and the orbits of GJ 251 b and c. Stellar size and orbital distances are to scale. In light green we show the optimistic HZ, and in dark green the conservative HZ (Kopparapu et al. 2013, 2014). GJ 251 c orbits directly in a regime where liquid water might be able to exist on its surface. -- astro-ph.EP

Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy

Discovery Of A Nearby Habitable Zone Super-Earth Candidate Amenable To Direct Imaging

by Keith CowingOctober 28, 2025October 29, 2025

NASA Spaceline Current Awareness List -- Grok via Astrobiology.com

Microgravity, Space Life Science, Space Stations, SPACELINE Current Awareness List

NASA Spaceline Current Awareness List #1,171 24 October 2025 (Space Life Science Research Results)

by Keith CowingOctober 28, 2025November 18, 2025

Artist's depiction of a coronal mass ejection from EK Draconis. The hotter and faster ejection is shown in blue, while the cooler and slower ejection is shown in red. Credit NAOJ

Habitable Zones, Origin & Evolution of Life, Radiation, Space Weather & Heliophysics

Coronal Mass Ejections At The Dawn Of The Solar System

by Keith CowingOctober 28, 2025October 28, 2025

Energy level diagram of the C + NH3 + CO reaction. The reaction proceeds from left to right. It starts with a triplet state; the intersystem crossings to the singlet states are marked with dashed arrows. S and TS stand for singlet and transition states. Red lines indicate the most probably pathway. -- astro-ph.GA

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

Chemical Modeling Of Aminoketene, Ethanolamine, And Glycine Production In Interstellar Ices

by Keith CowingOctober 28, 2025October 28, 2025

For the second stage of our analysis pipeline, outputs were further evaluated using a livability index L (scaled between 0 and 1). Among the 51 Mars-positive samples, the mean livability index was 0.417, with scores clustering at a midrange band of 0.31-0.48 (Table 5). These results suggest that most images were neutrally classified with the model neither stating high nor low livability rates across the tested data. Dust warnings were found to be common, with twenty-four samples flagged as “Warning” , twenty-five as “Caution” , and two as “Severe” (Table 6). -- eartharxiv.org

Biosignatures & Paleobiology, Desert Worlds, Habitable Zones, Imaging & Spectroscopy, Mars, Missions & Hardware, Robotics/Rovers/UAVs, Sample Return, Tricorders & Sensors

A Computer Vision Framework For Estimating Surface Habitability From Mars Using Convolutional Analysis

by Keith CowingOctober 28, 2025October 28, 2025