An autonomous underwater vehicle can propel itself efficiently by using the energy in nearby water currents. Underwater and aerial vehicles must make their way through a complex environment of gusts […]
water world
Posted inAstrogeology, Atmospheres, Climate, Weather, Lava / magma ocean / Volcanic Worlds, Status Report, Water/Hycean Worlds & Oceanography
On The Efficacy Of Ocean Formation With A Primordial Hydrogen Atmosphere
It has been suggested that Earth’s present water budget formed from oxidation reactions between its initial hydrogen-rich primordial atmosphere and its magma ocean.
![Darkening of the Global Ocean. (A) The rate change (units per year) in the diffuse attenuation coefficient for downwelling irradiance at 490 nm [ΔKd(490)] measured from MODIS Aqua between 2003 and 2022 in 9 km resolution (CRS: World Mollweide, ESRI:54009). Reds indicate regions where Kd(490) is increasing (oceans are getting darker), while blues indicate regions where Kd(490) is decreasing (oceans are getting lighter). White indicates regions where there was no statistically significant change in Kd(490) over the period 2003–2022. Values of ΔKd(490) were derived for each 9 km resolution pixel using quantile regression to the median performed on the fitted values of an Autoregressive Integrated Moving Average (ARIMA) model of annual averaged Kd(490) data. (B) International Hydrographic Office sea regions ranked according to the percentage of their area over which Kd(490) is increasing. Numbers inset above bars give the absolute area where Kd(490) is increasing in 10,000 km2. Raw data are presented in Table S4. Areas were calculated in CRS World Mercator (ESRI:54004). -- Global Change Biology](https://i0.wp.com/astrobiology.com/wp-content/uploads/2025/06/Water-Planet-Dynamics-Darkening.png?resize=1200%2C719&ssl=1)
Posted inAway Teams & Field Reports, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Gaia - Planetary Perspectives, Habitable Zones, Mapping, Geodesy, Cartography, Bathymetry, ROVs/Submersibles/Diving, Status Report, Water/Hycean Worlds & Oceanography
Water Planet Dynamics: Darkening Of Earth’s Global Ocean
The photic zones of the oceans—where sunlight and moonlight drive ecological interactions—are one of the most productive habitats on the planet and fundamental to the maintenance of healthy global biogeochemical […]
Posted inAtmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Icy Worlds, Imaging & Spectroscopy, Status Report, Water/Hycean Worlds & Oceanography
Habitable World Recon: Foundation Models For Remote Sensing and Earth Observation: A Survey
Remote Sensing (RS) is a crucial technology for observing, monitoring, and interpreting our planet, with broad applications across geoscience, economics, humanitarian fields, etc.
Posted inAtmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Status Report, Venus, Water/Hycean Worlds & Oceanography
Retention Of Surface Water On Tidally Locked Rocky Planets In The Venus Zone Around M Dwarfs
Terrestrial planets within the Venus zone surrounding M dwarf stars can retain surface ice caps on the perpetual dark side if atmospheric heat transport is inefficient, (as suggested by previous […]
Posted inAstrochemistry, Astrogeology, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Gaia - Planetary Perspectives, Gas Giants, Ice Giant, Icy Worlds, Status Report, Water/Hycean Worlds & Oceanography
Diversity Of Exoplanets
This review article delves into the study of low-mass exoplanets: super-Earths, mini-Neptunes and the new categories within and between that we are starting to discover.
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Status Report, Water/Hycean Worlds & Oceanography
HD 35843: A Sun-like Star Hosting A Long Period Sub-Neptune And Inner Super-Earth
We report the discovery and confirmation of two planets orbiting the metal-poor Sun-like star, HD 35843 (TOI 4189). HD 35843 c is a temperate sub-Neptune transiting planet with an orbital […]
Posted inAstrochemistry, Astrogeology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Icy Worlds, Imaging & Spectroscopy, Status Report, Water/Hycean Worlds & Oceanography
Dust-driven Vortex Cascades Originating At Water Snow Region: A Pathway To Planetesimal Formation
The origin of observed planetary systems, including our solar system, as well as their diversity is still an open question.
Posted inBiochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Extremeophiles and Extreme Environments, Fossils & Paleontology, Gaia - Planetary Perspectives, Habitable Zones, Icy Worlds, Origin & Evolution of Life, Status Report, Water/Hycean Worlds & Oceanography
Microbial Ecology Of Serpentinite-hosted Ecosystems
Serpentinization, the collective set of geochemical reactions initiated by the hydration of ultramafic rock, has occurred throughout Earth history and is inferred to occur on several planets and moons in […]
Posted inAstrogeology, Biogeochemical Cycles & Geobiology, Habitable Zones, Mapping, Geodesy, Cartography, Bathymetry, Mars, Press Release, Water/Hycean Worlds & Oceanography
New Study on Why Mars Is Red Supports Potentially Habitable Past
A new international study partially funded by NASA on how Mars got its iconic red color adds to evidence that Mars had a cool but wet and potentially habitable climate […]