![A comparison of the upwards and downwards long-wave radiative fluxes (left and middle column) after 2000 years using a tidally-locked co-ordinate system. AS, T and SS denote the antistellar point, terminator and substellar point respectively. The right-hand column shows the difference in fluxes in filled contours, which are overlain by solid black contours that indicate the percentage increase of specific humidity in the 100 m versus the 10 m simulation.-- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/The-Hydrological.png?resize=1200%2C720&ssl=1)
[astro-ph.EP] Tidally-locked planets express a range of climate regimes distinct from those found in our solar system.
Gaia – Planetary Perspectives
![Percentage of 1,000 stochastic paths that converge shown as color maps for e “ 0.1, 0.3. The two bracketed values in the title of each sub-figure are the critical deterministic values of S ˚ for convergence and bifurcation given in Table A.2. The white and black horizontal lines are the convergence and bifurcation values respectively. Additional figures are found in the Supplementary Material (Appendix C). -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Stochastic-Snowball.png?resize=1200%2C720&ssl=1)
Posted inBiogeochemical Cycles & Geobiology
Stochastic Snowball States in Planetary Climate
[astro-ph.EP] Motivated by the recent finding of Ji and Abbot (2025) that at moderate eccentricity (0.2–0.3) the planetary Snowball bistability vanishes, we have introduced stochasticity of the orbital eccentricity into […]
![Temperature space-time diagram for the 300 K initial condition for the fiducial Earth model planet at (a) 0.930 AU (temperate state), and (b) 0.920 AU (post-runaway). The red contour denotes the 323 K isotherm.-- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/Gen-EBM.png?resize=1200%2C697&ssl=1)
Posted inAtmospheres, Climate, Weather
Gen-EBM: An Energy Balance Model For Terrestrial Planets. Climate Multistability From Snowball To Post-runaway Greenhouse Climates
[astro-ph.EP] Climate multistability and tipping points are fundamental properties of planetary climates that depend sensitively on climate feedbacks.
Posted inBiogeochemical Cycles & Geobiology
Material Cycling Across Earth’s Spheres And Triggers Of Cambrian Explosion: A Tectonic Perspective
[ELSP] A comprehensive model of the Cambrian explosion featuring “multi-factors coupling and multi-sphere driving”. Supercontinent breakup and mantle plume activity served as the initial trigger of environmental change in the […]
Posted inMars
Mars’ Oddest Cloud May Be Even Odder Than We Thought
[ESA]. Scientists using the European Space Agency’s Mars Express, in combination with a state-of-the-art meteorological model of the Red Planet, have found that there may be some very exotic physics […]
Posted inTitan
Oxidation Of Photochemical Organic Hazes: A Prebiotic Source of Oxygen-Bearing Organics in Titan’s Atmosphere And Early Earth?
[Astrobiology via PubMed]. Photochemical organic hazes such as those found in the atmosphere of Titan, the largest satellite of Saturn, are mainly composed of reduced chemical components.
![Simulated climates and observables for CO2-rich planets near the outer edge of the habitable zone. The illustration on the right depicts a potentially habitable world orbiting a Sun-like star. The teal point in the lower left section of the panel marks the orbital location of such a planet within the OHZ, and the corresponding reflected light spectrum that could be observed via direct imaging is shown in teal in the middle, left section of the panel. The upper left section of the panel shows an illustration of the same planet in a globally frozen state located just beyond the habitable zone. Its orbital position (lower left) and reflected light spectrum (middle) are shown in white. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/10/High-CO2.png?resize=1200%2C721&ssl=1)
Posted inHabitable Zones
High-CO2 Climates And Observables In The Outer Habitable Zone
[astro-ph.EP] The habitable zone (HZ) is a fundamental concept used to guide our search for temperate exoplanets with stable surface liquid water that would sustain remotely detectable biosignatures.
Posted inMicrobiology & Virology
Controlled Near-space Exposure Induces Community Restructuring In An Ocean Water Microbiome
[biorxiv.org] Marine microbiomes may experience extreme environmental stress during atmospheric transport, yet how near-space conditions reshape natural microbial communities remains poorly understood.
Posted inAtmospheres, Climate, Weather
Ancient Seas Reveal Times When The Earth Rapidly Shifted Relative To Its Axis
[AAAS] Ancient sea-level changes provide new evidence that during the Jurassic and Cretaceous, Earth underwent episodes of rapid “true polar wander” (TPW).
Posted inWater/Hycean Worlds & Oceanography
How Ocean Chemistry On Earth Helped Life Keep Breathing
[UC Riverside] Scientists have helped solve a longstanding mystery about how Earth remained habitable after oxygen first accumulated in its atmosphere more than 2 billion years ago, providing evidence that […]