icy world Archives

Planetary exploration is characterized by unknowns, which are both the primary reason and challenge for exploration.

Biosignatures & Paleobiology, Caves, Craters, Mountains, Subsurface, Lava Tubes, Comets and Asteroids, Exploration Gear & Tech, Habitable Zones, Imaging & Spectroscopy, Reports, Roadmaps, & Plans, Robotics/Rovers/UAVs, ROVs/Submersibles/Diving, Sample Return, Status Report, Tricorders & Sensors

Planetary Exploration 3.0: A Roadmap for Software-Defined, Radically Adaptive Space Systems

by Keith CowingApril 24, 2026April 24, 2026

The surface and subsurface of worlds beyond Mars remain largely unexplored. Yet these worlds hold keys to fundamental questions in planetary science – from potentially habitable subsurface oceans on icy […]

Bond albedo (a) and thermal inertia (b) maps derived from PPR measurements in this study. Background is the USGS Europa Voyager Galileo SSI Global Mosaic of Europa (Becker et al. 2010). -- astro-ph.EP

Analog Studies, Arctic / Antarctic / Alpine, Europa, Icy Worlds, Imaging & Spectroscopy, Mapping, Geodesy, Cartography, Bathymetry, Status Report, Water/Hycean Worlds & Oceanography

Thermophysical Properties of Europa’s Surface Constrained by Galileo Photopolarimeter-Radiometer Temperature Measurements

by Keith CowingApril 18, 2026April 18, 2026

Thermal measurements constrain the physical properties of icy satellite surfaces, including grain size, porosity, and regolith structure. On Europa, analyses of the Galileo Photopolarimeter-Radiometer (PPR) dataset revealed thermal inertia heterogeneities, […]

Top row: coma maps of H2O, CO2, and CH4, computed as the molecular column density from a pixel-by-pixel retrieval analysis for Observations 6, 15, and 6, respectively. The sunward and target velocity directions are denoted by the white arrows. The target centroids, computed as the photocenter in the median-stacked images (Figure 1), are marked with the black points. For H2O and CO2, the white contours correspond to emission levels of 50% and 20% relative to the maximum value and illustrate the slight anti-sunward extension of the respective comae. The contours are omitted in the CH4 panel due to the poorer signal-to-noise ratio of the data. Bottom row: corresponding median-stacked images across the continuum wavelengths within each fluorescence region. The H2O coma map shows significant enhancement in emission level at large nucleocentric distances relative to the dust continuum, indicating extended H2O production within the coma. -- arxiv.org

Astrochemistry, Astrogeology, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Comets and Asteroids, Icy Worlds, Imaging & Spectroscopy, Intelligence & Language, Interstellar, Press Release

Interstellar Comet Reveals Methane On Its Journey Through Our Solar System

by Keith CowingApril 18, 2026April 18, 2026

Interstellar comet 3I/ATLAS is now on its way out of our solar system, never to return.

An image taken by the Solid State Imager onboard the Galileo spacecraft showing the Rhadamanthys region, including its lineae and varied topography. The Rhadamanthys Lineae offer several examples of prominent double ridges, a few examples of which are labeled. Low albedo material is closely correlated with the topography for many ridges. For others, including the ridge cutting from northwest to southeast, reddening is more diffuse and can be found on the ridge margins. Note the pits in the top left of the image, which can also display varied amounts of reddening. Image from NASA/JPL-Caltech/University of Arizona.

Astrochemistry, Astrogeology, Europa, Icy Worlds, Imaging & Spectroscopy, Mapping, Geodesy, Cartography, Bathymetry, Status Report

Thermal Segregation and Reddening in Europa’s Double Ridges

by Keith CowingApril 15, 2026April 15, 2026

Europa’s double ridges often display lower albedo and redder color than their surroundings. Their unique topography may cause sublimation-driven darkening due to illumination and self-heating, a process known as thermal […]

Example of altimeter echo received from plains. This waveform was recorded during flyby T30 from an altitude of 1964.9 km at an incidence angle 0.0137°. Panel (a) shows a context map. Section of the T30 altimeter track observing the plains from point A to C. The waveform resulting from the integration of three echoes (Burst ID 131027162/4) located at point B is shown in panel (b) the altimetric model is used to fit the echo, resulting in an estimated RMS height of 4 m over the 115 square km footprints. The fitting error is indicated as a percentage by the mean integral relative error (MIRE). Panel (c) shows the large-scale topography of the plains using three elevation trackers, Maximum Likelihood, Threshold, and First Moment. All three trackers agree that the overall surface height changes less than 50 m over 50 km. -- JGR Planets

Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Habitable Zones, Icy Worlds, Mapping, Geodesy, Cartography, Bathymetry, Status Report, Titan

Titan’s Plains Revealed: Evidence For A Layered Surface

by Keith CowingApril 10, 2026April 10, 2026

Undifferentiated plains are the most common terrain type on Titan, yet their composition and geologic history remain poorly understood.

Subglacial lake in the Canadian Arctic -- University of Waterloo

Analog Studies, Arctic / Antarctic / Alpine, Cryobiology, Icy Worlds, Imaging & Spectroscopy, Mapping, Geodesy, Cartography, Bathymetry, Press Release

Ice Planet Cartography: First Cataloguing Of Lakes Beneath The Canadian Arctic

by Keith CowingApril 9, 2026April 9, 2026

Researchers have created the first map of a network of subglacial lakes in the Canadian Arctic showing 33 bodies of water under glaciers.

Antarctic Circumpolar Current (Photo: Alfred Wegener Institute / Hanna Knahl, Patrick Scholz)

Atmospheres, Climate, Weather, Gaia - Planetary Perspectives, Icy Worlds, Imaging & Spectroscopy, Mapping, Geodesy, Cartography, Bathymetry, Press Release, Water/Hycean Worlds & Oceanography

Icy Ocean World Recon: How Did Earth’s Most Powerful Ocean Current Form?

by Keith CowingApril 9, 2026April 9, 2026

It transports far more than 100 times as much water as all of the Earth’s rivers combined: The Antarctic Circumpolar Current rushes around the southern continent unhindered by land masses […]

Four diagnostics of electron bombardment on Europa’s leading hemisphere: (a) total deposited-energy flux, (b) deposited-energy fraction, (c) mean secondary-electron energy, and (d) e-folding (≈ 63%) deposition depth. Cells with no electron flux in the relevant energy range are shown in gray. -- astro-ph.IM

Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Comets and Asteroids, Icy Worlds, Imaging & Spectroscopy, Interstellar, Status Report

Geant4-IcyMoons: Simulating Electron Interaction Physics in Irradiated Astrophysical Ices

by Keith CowingApril 3, 2026April 3, 2026

Energetic particles continuously process water ice across astrophysical and planetary environments, from interstellar clouds and comets to icy planetary surfaces. Interpreting the resulting observables requires a physically grounded description of […]

Numerical solutions for the three high-diffusivity

Astrogeology, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Enceladus, Icy Worlds, Imaging & Spectroscopy, Saturn, Status Report, Water/Hycean Worlds & Oceanography

Subsurface Ocean Salinity And Dissipation Rate Inferred From Enceladus Ice Shell Morphology

by Keith CowingMarch 31, 2026March 31, 2026

The habitability of Enceladus’ subsurface ocean and the detectability of potential biosignatures depend on efficient ocean circulation and suitable ocean conditions.

Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Europa, Habitable Zones, Icy Worlds, Imaging & Spectroscopy, Jupiter, Mapping, Geodesy, Cartography, Bathymetry, Missions & Hardware, Origin & Evolution of Life, Status Report, Tricorders & Sensors, Water/Hycean Worlds & Oceanography

Biomarkers on the Icy Jovian Moons: Can Europa Also Provide Insights into Life’s Origin?

by Keith CowingMarch 31, 2026March 31, 2026

Within the payloads of JUICE and Europa Clipper, there are instruments suitable for the search of specific biosignatures that can diagnose life tracks in two ways.

icy world

Planetary Exploration 3.0: A Roadmap for Software-Defined, Radically Adaptive Space Systems

Thermophysical Properties of Europa’s Surface Constrained by Galileo Photopolarimeter-Radiometer Temperature Measurements

Interstellar Comet Reveals Methane On Its Journey Through Our Solar System

Thermal Segregation and Reddening in Europa’s Double Ridges

Titan’s Plains Revealed: Evidence For A Layered Surface

Ice Planet Cartography: First Cataloguing Of Lakes Beneath The Canadian Arctic

Icy Ocean World Recon: How Did Earth’s Most Powerful Ocean Current Form?

Geant4-IcyMoons: Simulating Electron Interaction Physics in Irradiated Astrophysical Ices

Subsurface Ocean Salinity And Dissipation Rate Inferred From Enceladus Ice Shell Morphology

Biomarkers on the Icy Jovian Moons: Can Europa Also Provide Insights into Life’s Origin?

Astrobiologist Dale Andersen’s Antarctic Field Report: 11 November 2026: Weather Update And Forecast

Astrobiologist Dale Andersen’s Antarctic Field Report: 10 November 2026: Weather Update Forecast

Dispersal of Bacterial Spores Away From Spacecraft on the Martian Surface is Unlikely to Contaminate Subsequent Life-detection Samples

From Exo-Earth Detection to Atmospheric Characterization: Enabling Phase-Dependent Molecular Detection SNR in EXOSIMS

Ancient Rocks Reveal When Earth’s Tectonic Engine Switched On