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COP31 Ice Planet Update: Earth’s Cryosphere Decline Is Beyond Safe Planetary Limits
[Stockholm Resilience Centre] New research published today at COP31 issues a stark warning about the health of the frozen parts of the planet – ice sheets, mountain glaciers, sea ice, permafrost, and snow cover – known as the cryosphere. The study, published in Science, finds that human-driven climate change is degrading these landscapes beyond safe…
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Possible Lake Remnants Inside a Crater at the Edge of Isidis Planitia, Mars
[NASA]. This observation features polygonal cracks that may be the remnants of an ancient lake…
Seven Genome Sequences Of Bacterial Environmental Isolates From The Western Coast Of The Greenland Ice Sheet
[Microbiology Resource Announcements] We report the genomic sequences of seven bacterial isolates from the western…
Cosmic-ray Particles Can Help Probe The Powerful Electric Fields Inside Earth’s Thunderstorms
[Sissa Medialab] Earlier observations with the GRAPES-3 muon telescope revealed that thunderclouds can develop electrical…
Earth As A Potential Source Of Llife For Europa’s Subsurface Ocean
The paper discusses the possibility of dust particles containing living bacteria ejected from Earth reaching Europa and landing on its surface. It is shown that, taking certain factors into account, over a period of 30 − 80 Myr (the estimated age of Europa’s ocean), Jupiter’s moon would have been impacted…
Keep readingDust To Dust: Prospects For Passive Technosignatures As Relics Of ETI
Technological societies are separated in time, not just space — that is the lesson of the Drake equation. Might the best way to seek them be to find technosignatures that persist long after their creators? I present work I and my collaborators have done on the idea of passive technosignatures,…
Keep readingExoplanets, -moons, -comets
Astronomy & Telescopes
Atmospheres, Climate, Weather
From Anoxic to Oxic Earth: Detectability of Atmospheric Biosignatures Across Stellar Hosts with ELT/ANDES
[astro-ph.EP]. Earth’s atmosphere evolved from an anoxic, methane-bearing Archean state through Proterozoic oxygenation to the O2-rich modern atmosphere. However, most biosignature detectability studies focus on modern Earth, leaving earlier atmospheric states comparatively unexplored. We investigate how atmospheric evolution and stellar environments influence the detectability of O2, CH4, H2O, and CO2, and their potential to distinguish…
Read moreExploration Gear & Tech
Mechanisms Of Unique Chaotropic Resistance And Biocalcification In A Halophilic Virgibacillus Isolated From Ephemeral Microbial Mats Of The Calcium-rich Don Juan Pond In Antarctica
[Frontiers of Biology] Introduction: Don Juan Pond (DJP), located in the McMurdo Dry Valleys of Antarctica, is one of the most extreme cold aquatic environments…
Mars Seed: A Reference Architecture for Biomanufacturing Habitats from Martian Resources
[astro-ph.IM] Human exploration of Mars will require enormous quantities of materials for the first crewed missions and substantially more for permanent habitation, making flexible and…
Astrobiologist Dale Andersen’s Antarctic Field Report: 10 November 2026: Weather Update Forecast
Dale Andersen: “the winds began to pick up earlier today, and we now have 30 mph winds, using 42 mph (max gust so far has…
Imaging & Spectroscopy
Astrobiologist Dale Andersen’s Antarctic Field Report: 9 November 2026: Lake Untersee Basecamp Update
[Dale Andersen]. Keith, The last few days we have worked hard to get our camp set up. We are almost there, with everything but the…
The Limits of Tidal Circularization and Atmospheric Escape for Mini-Neptunes and Super-Earths: The Case of TOI-2257 b
[Planetary Science Journal ] With a 35 day orbital period and ∼0.5 eccentricity, TOI-2257 b occupies a sparsely populated corner of transiting mini-Neptune parameter space…
Expanding the Volatile Abundance Inventory for High-Priority K-Dwarf JWST Exoplanet Systems
[astro-ph.SR] There are exceedingly few chemical abundance measurements available in the literature for K dwarf stars, especially for those with Teff< 4700 K due to…
Biosignatures & Paleobiology
Earth as a Potential Source of Life for Europa’s Subsurface Ocean
[International Journal of Astrobiology] The paper discusses the possibility of dust particles containing living bacteria ejected from Earth reaching Europa and landing on its surface.…
The Kinetic Basis of the Genetic Code
[q-bio.OT] The origin of the genetic code is an enigma, requiring explanations for the emergence of degeneracy, the organizational structure of the code, and the…
Power Density as a Universal Biosignature: An Application to the Stellivore Hypothesis
[physics.gen-ph] Power density is a central measure underlying a common thread in cosmic evolution. It measures the rate at which free energy transits in a…