Gaia Archives

A complex web of interactions between geological features including volcanoes, subsurface mantle, oceans and the atmosphere created the chemical mixture necessary for early life to oxygenate our atmosphere. -- Credit ©2025 Watanabe et al. CC-BY-ND

Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Gaia - Planetary Perspectives, Habitable Zones, Lava / magma ocean / Volcanic Worlds, Microbiology & Virology, Press Release, Terraforming & Geoengineering, Water/Hycean Worlds & Oceanography

Are Volcanoes Behind The Oxygen We Breathe?

by Keith CowingMarch 12, 2025March 12, 2025

It is widely believed that Earth’s atmosphere has been rich in oxygen for about 2.5 billion years due to a relatively rapid increase in microorganisms capable of performing photosynthesis. Researchers, […]

Replicate-averaged steady state solutions of the biogeochemical mode under different boundary conditions. Each color point shows the average of 1,000 simulations equivalent to those given in Fig. 2. The Top row shows the effect of changing the baseline selection and mutation parameters, first under boundary conditions in which the biological byproduct flux is always zero (there is no feedback via the X cycle, 𝑋𝑣⁢𝑎⁢𝑟⁢0=0), the second row under conditions in which it is an increasing function of the product of reactions A and B (this feedback does exist, 𝑋𝑣⁢𝑎⁢𝑟⁢0=1). The Bottom row shows (for constant selection and mutation coefficients) the effect of incremental variation in the baseline magnitude of the byproduct flux 𝑋𝑣⁢𝑎⁢𝑟⁢0 and the suppression function 𝛼0. Columns A-F show, respectively, the mean level of J-variant (i.e., 13 ⁢(𝐽1+𝐽2+𝐽3)), the value of X, the mean (cross species averaged) relative frequency of the reaction-performing p-genotype, the final value of the suppression function 𝛼=𝑓⁡(𝑋), and the final normalized relative value of the two CBVs. -- PNAS via PubMed

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Gaia - Planetary Perspectives, Habitable Zones, Origin & Evolution of Life, Status Report

Persistence Selection Between Simulated Biogeochemical Cycle Variants For Their Distinct Effects On The Earth System

by Keith CowingMarch 10, 2025March 9, 2025

The average long-term impact of Darwinian evolution on Earth’s habitability remains extremely uncertain. Recent attempts to reconcile this uncertainty by “Darwinizing” nonreplicating biogeochemical processes subject to persistence-based selection conform with […]

Microscopic Textularia agglutinans show a sensitivity to changes in environmental conditions.

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Extinction events, Fossils & Paleontology, Gaia - Planetary Perspectives, Habitable Zones, Press Release, Water/Hycean Worlds & Oceanography

Ancient Marine Organisms Play A Role In Recording Past Climate Change On Earth

by Keith CowingMarch 4, 2025March 4, 2025

A new study led by an international team, including researchers from The University of Western Australia, has discovered that a common marine organism could provide new ways to monitor ocean […]

Gaia - Planetary Perspectives, Status Report

And Thus Begins A New Year For Life On Earth

by Keith CowingJanuary 1, 2025December 31, 2024

Earth’s limb at sunset as photographed by one of the Expedition Two crew members with a digital still camera aimed through the nadir window of the U.S. laboratory Destiny during […]

A diagram of the worldbuilding pipeline developed for this study. The pipeline begins with the global and technology factors that define each scenario from Table 5 and other assumptions common to all scenarios (grey). These inputs are given to the Claude LLM, which then generates a description of the world (blue). Additional narrative and descriptions of the planetary bodies are added manually (purple). This information provides the basis for a human needs assessment that determines the different uses of land on each planetary body (orange). These results are used to describe the physical technosphere and potentially detectable technosignatures (yellow), which provide recommendations for technosignature detection (green). -- astro-ph.IM

Gaia - Planetary Perspectives, Intelligence & Language, Interstellar, Science Fiction, SETI & Technosignatures, Status Report

Projections of Earth’s Technosphere. I. Scenario Modeling, Worldbuilding, and Overview of Remotely Detectable Technosignatures

by Keith CowingNovember 30, 2024

This study uses methods from futures studies to develop a set of ten self-consistent scenarios for Earth’s 1000-year future, which can serve as examples for defining technosignature search strategies.

Dynamical Systems At Work on Earth -- Grok via Astrobiology.com

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Extinction events, Gaia - Planetary Perspectives, Habitable Zones, Origin & Evolution of Life, Status Report

A Dynamical Systems Perspective On The Celestial Mechanical Contribution To The Emergence Of Life

by Keith CowingNovember 4, 2024November 4, 2024

Biological activities are often seen entrained onto the day-night and other celestial mechanical cycles (e.g., seasonal and lunar), but studies on the origin of life have largely not accounted for […]

Near the end of flight day one, the Apollo 15 crew took this photo of the receding Earth from a distance of about 55,000 miles. -- NASA Larger image

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Extinction events, Extremeophiles and Extreme Environments, Gaia - Planetary Perspectives, Habitable Zones, Microbiology & Virology, Origin & Evolution of Life, Status Report

Astrovirology And Terrestrial Life Survival

by Keith CowingSeptember 30, 2024September 29, 2024

Microbial organisms have been implicated in several mass extinction events throughout Earth’s planetary history. Concurrently, it can be reasoned from recent viral pandemics that viruses likely exacerbated the decline of […]

An underground biovault on the Moon -- Grok via Astrobiology.com

Cryobiology, Extinction events, Gaia - Planetary Perspectives, Genomics, Proteomics, Bioinformatics, Habitable Zones, Life Support Systems, Panspermia, Planetary Protection & Biosafety, Sample Return, Societal Issues, Status Report, Terraforming & Geoengineering

Safeguarding Earth’s Biodiversity By Creating A Lunar Biorepository

by Keith CowingSeptember 30, 2024September 29, 2024

Earth’s biodiversity is increasingly threatened and at risk. We propose a passive lunar biorepository for long-term storage of prioritized taxa of live cryopreserved samples to safeguard Earth’s biodiversity and to […]

The skies above the Amazon are almost always churning with clouds and storms, making the basin one of the most difficult places for scientists to map and monitor. The astronaut photograph above—taken while the International Space Station was over the Brazilian state of Tocantins—captures a common scene from the wet season. Vast pillars of moisture rise via convection and then spread outward into anvil clouds as they collide with the stratosphere. larger image -- NASA

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Gaia - Planetary Perspectives, Habitable Zones, Status Report, Water/Hycean Worlds & Oceanography

Substantial Extension of the Lifetime of the Terrestrial Biosphere

by Keith CowingSeptember 18, 2024September 18, 2024

Approximately one billion years (Gyr) in the future, as the Sun brightens, Earth’s carbonate-silicate cycle is expected to drive CO2 below the minimum level required by vascular land plants, eliminating […]

Average FLEXPART time-altitude 120-hr backwards simulation for the composite of all 10 flights in 2014 (X axis denotes hours since 10.000 particles -log10 scale- were thrown at 3 h steps from Tokyo; colours denote concentration of particles in the total column from the surface up to 5 km; see Methods). “F” denotes flight days.--PNAS

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biophysics, Biosignatures & Paleobiology, Gaia - Planetary Perspectives, Microbiology & Virology, Origin & Evolution of Life, Panspermia, Planetary Protection & Biosafety, Press Release

Microorganisms Can Travel Vast Distances In Earth’s Troposphere

by Keith CowingSeptember 17, 2024September 17, 2024

Analysis of air samples taken at altitudes of up to 3,000 metres above Japan has revealed the presence of a vast range of viable bacteria and fungi transported by air […]