While Io, the most volcanically active moon in the solar system, appears completely dry and devoid of water ice, its neighbor Europa is thought to harbor a vast global ocean […]
Ganymede
Posted inCallisto, Europa, Ganymede, Icy Worlds, Io, Jupiter, Status Report
Callisto’s Nonresonant Orbit As An Outcome Of Circum-Jovian Disk Substructure
The Galilean moons of Io, Europa, and Ganymede exhibit a 4:2:1 commensurability in their mean motions, a configuration known as the Laplace resonance.
Posted inCallisto, Europa, Ganymede, Icy Worlds, Io, Jupiter, Status Report
Not Just Gas: How Solid-Driven Torques Shaped the Migration of the Galilean Moons
The primary aim of this study is to investigate the orbital migration of the Galilean moons by incorporating self-consistent solid dynamics in circumjovian disk models. We perform two-fluid simulations using […]
Posted inAriel, Astrogeology, Callisto, Ceres, Charon, Dione, Enceladus, Europa, Ganymede, Iapetus, Ice Giant, Icy Worlds, Mapping, Geodesy, Cartography, Bathymetry, Mars, Mimas, Miranda, Missions & Hardware, Moon, Oberon, Phoebe, Pluto, Polar / Alpine Expeditions, Rhea, Status Report, Tethys, Titan, Titania, Triton, Umbriel, Water/Hycean Worlds & Oceanography
Icy Worlds: Moons And Dwarf Planets
In the outer solar system beyond Jupiter, water ice is a dominant component of planetary bodies, and most solid objects in this region are classified as icy bodies.
Posted inBiochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biophysics, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Extremeophiles and Extreme Environments, Habitable Zones, Status Report
Exomorphic Catalysis: A Discipline Dedicated to Energetic Disequilibria and the Activation of Life-Potential in Non-Terrestrial Environments
The search for life beyond Earth has long been guided by two dominant paradigms: astrobiology, which seeks environments capable of supporting life as we know it, and planetary engineering, which […]
Posted inAstrochemistry, Astrogeology, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Callisto, Exoplanets, -moons, -comets, Ganymede, Icy Worlds, Imaging & Spectroscopy, Press Release
Webb Studies A Carbon-rich Moon-Forming Disk Around A Massive Planet
NASA’s James Webb Space Telescope has provided the first direct measurements of the chemical and physical properties of a potential moon-forming disk encircling a large exoplanet. The carbon-rich disk surrounding […]
![The region in which dark matter impacts may leave detectable surface features on Ganymede. Gray regions correspond to existing constraints [33, 35, 37]. The light purple region is the region in which the dark matter has sufficient initial energy to penetrate through the 12 km conductive ice layer on Ganymede’s surface. The darker purple region corresponds to when the dark matter penetrates the entirety of Ganymede, leaving both an entrance and exit wound. Rough estimates for the approximate number of craters and crater radius from Eqs. 1 and 13 are provided on the top and right axes respectively, rounded to one significant figure for readability. -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2025/08/Dark-Wounds-On-Icy-Moons.png?resize=1200%2C720&ssl=1)
Posted inAstrogeology, Astronomy & Telescopes, Ganymede, Icy Worlds, Imaging & Spectroscopy, Impact events, Status Report
Dark Wounds On Icy Moons: Ganymede’s Subsurface Ocean As A Dark Matter Detector
Dark matter in the form of macroscopic composites is largely unconstrained at masses of ∼1011−1017 g. In this mass range, dark matter may collide with planetary bodies, depositing an immense […]
Posted inAnalog Studies, Arctic / Antarctic / Alpine, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biophysics, Biosignatures & Paleobiology, Cryobiology, Enceladus, Europa, Ganymede, Icy Worlds, Press Release, Titania, Water/Hycean Worlds & Oceanography
A Thermodynamic Perspective On Potential Life In Icy Ocean Worlds
Dr. Seda Işık, who completed her doctorate at Istanbul Technical University (ITU) Eurasia Institute of Earth Sciences in the Earth System Science Program, achieved significant results in interpreting chemical evidence […]
![A: Schematic of the ultra-high vacuum chamber used for electron irradiation experiments of Europan ice analogs. B: Shift in the resonant frequency of the QCM during co-deposition of H2O and CO2 ice from dedicated gas dosers. We first condense CO2 [1] from a doser at a constant rate of (0.25 ± 0.01) Hz/s (zoomed in the inset). We then admit water vapor [2] through a second doser which increases the deposition rate to (4.8 ± 0.2) Hz/s. When the film approaches the desired thickness (2.8 µm, which corresponds to a frequency shift of ∼ 21, 000 Hz), we terminate H2O gas deposition first [3] and continue with CO2 condensation briefly to ensure the terminal CO2 rate did not drift significantly from the initial value (< 10%). The CO2 doser is shut off at [4]. This co-deposition scheme using multiple gas dosers with QCM gravimetry allows for producing mixed ices with precisely tailored composition. This film has CO2 intimately mixed with water ice at (2.5 ± 0.1)% (by number) concentration. -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2025/06/Laboratory-Investigation-Of-CO2-Driven.png?resize=1200%2C733&ssl=1)
Posted inBiochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Charon, Europa, Ganymede, Icy Worlds, Imaging & Spectroscopy, Status Report
Laboratory Investigation Of CO2-Driven Enhancement Of Radiolytic H2O2 On Europa And Other Icy Moons
Observations of Europa’s leading hemisphere reveal elevated H2O2 in the warmer, low latitude chaos terrains compared to the colder, polar regions.
Posted inAstrogeology, Biogeochemical Cycles & Geobiology, Callisto, Ganymede, Icy Worlds, Mapping, Geodesy, Cartography, Bathymetry, Press Release
Conditions For Accretion Favoring An Unmelted Callisto And A Differentiated Ganymede
Analysis of Callisto’s moments of inertia, derived from Galileo’s gravity data, suggests that its structure is not fully differentiated.