Europa Archives

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 […]

Pressure–temperature (P–T) conditions of our experiments compared to phase diagram of the CO2–H2O system. Red dots correspond to actual P–T conditions at various stages of ice preparation. Dashed lines are only indicative and do not correspond to measured variations in pressure. Paths labeled in red, yellow, and magenta correspond to ice retaining CO2. Paths labeled in black correspond to ice devoid of CO2. Lowercase letters show the stages of the experiment described in the text, with subscripts showing the applicable experiment number. The stars near the bottom left denote the P–T conditions during acquisition of spectra. -- astro-ph.EP

Astrochemistry, Astrogeology, Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biophysics, Biosignatures & Paleobiology, Europa, Icy Worlds, Imaging & Spectroscopy, Status Report

The Fate Of Frozen Carbonated Water At Europa-like Conditions

by Keith CowingApril 13, 2026April 13, 2026

We present the results of experiments probing the retention of CO2 in crystalline water ice, frozen sodium chloride (NaCl) brines, and flash-frozen carbonated water using diffuse reflectance infrared spectroscopy.

Artist’s impression of the simulations conducted in this research. Jupiter (lower left) has a strong magnetic field which creates a cavity in its circumplanetary disk. Saturn (upper right) lacks a strong magnetic field so its circumplanetary disk evolves without a cavity. Credit: Yuri I. Fujii/L-INSIGHT [Kyoto University], Illustrator: Shinichiro Kinoshita

Astrogeology, Callisto, Enceladus, Europa, Ganymede, Gas Giants, Icy Worlds, Io, Jupiter, Magnetic Fields, Electromagnetism, bioelectricity,, Press Release, Rhea, Saturn, Titan, Water/Hycean Worlds & Oceanography

How Jupiter Cultivated More Large Moons Than Saturn

by Keith CowingApril 8, 2026April 8, 2026

The two largest planets in our Solar System, Jupiter and Saturn, also have the largest satellite systems, or the most moons. At present, Jupiter’s reported moon count stands at more […]

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.

Schematic of the procedure in two sets of experiments performed with carbonated water. The Planetary Science Journal

Analog Studies, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Europa, Exoplanets, -moons, -comets, Habitable Zones, Icy Worlds, Imaging & Spectroscopy, Status Report, Water/Hycean Worlds & Oceanography

The Fate of Frozen Carbonated Water at Europa-like Conditions

by Keith CowingMarch 20, 2026

A Scanning Electron Microscope (SEM) micrograph of a SiGe transistor for use on ocean worlds. This SiGe IC is built from large numbers of micron-sized (10^-6 m) SiGe transistors to enable electronic functionalities such as communications, sensing, and control. The entire SiGe IC is 5x5 mm^2 and the X-band (8-12 GHz) SiGe RF communications link is shown in the lower right. Image credit: John D. Cressler, Georgia Tech

Biosignatures & Paleobiology, Caves, Craters, Mountains, Subsurface, Lava Tubes, Europa, Exploration Gear & Tech, Extremeophiles and Extreme Environments, Icy Worlds, Missions & Hardware, Nanotechnology & SynBio, Press Release, Radiation, Robotics/Rovers/UAVs, Tricorders & Sensors, Water/Hycean Worlds & Oceanography

Tricorder Tech: Developing Robust Electronics That Can Withstand Harsh Conditions on Cold Planetary Bodies

by Keith CowingMarch 17, 2026March 17, 2026

A NASA-sponsored team has developed electronics that can operate reliably in the harsh radiation and temperature conditions found on distant planetary bodies like Europa, an ocean world orbiting Jupiter. Not […]

Qualitative projections of the best-fit three-dimensional spherical-harmonic model to the jointly decomposed first spatial mode, u(1), derived from three viewing geometries of Europa’s leading hemisphere. (e) Water-ice 3.1 µm Fresnel peak (ℓmax = 6). (g) CO2 absorption doublet near 4.25 µm (ℓmax = 7). Shaded outlines mark Tara, Powys, and the leading-hemisphere part of Annwn Regiones. The left panels show jointly decomposed spectral modes (v(0) and v(1) in gray and black, respectively) and spectra from the spaxels where the joint spatial mode peaks (blue) and reaches its minimum (red). -- astro-ph.EP

Astrogeology, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Europa, Habitable Zones, Icy Worlds, Imaging & Spectroscopy, Mapping, Geodesy, Cartography, Bathymetry, Status Report

Spectral Decomposition Reveals Surface Processes on Europa

by Keith CowingMarch 16, 2026March 16, 2026

Competing processes shape Europa’s surface: geological activity replenishes material through resurfacing, while bombardment by charged particles alters surface chemical composition. Each process leaves distinct spectral signatures.

Transmission electron microscope image at low and high magnifications of a cell grown under 20 MP -- Frontiers

Analog Studies, Arctic / Antarctic / Alpine, Biophysics, Biosignatures & Paleobiology, Cryobiology, Europa, Extremeophiles and Extreme Environments, Genomics, Proteomics, Bioinformatics, Habitable Zones, Icy Worlds, Microbiology & Virology, Press Release, Water/Hycean Worlds & Oceanography

Microbes From Ambient-pressure Analogues Offer Insights Into Possible Life In Europa’s High-pressure Subsurface Ocean

by Keith CowingMarch 3, 2026March 3, 2026

Under its thick ice layer, Europa contains a shielded liquid water ocean where habitable conditions may exist. To effectively assess the habitability of this environment and the implications on putative […]

We investigated the survival of the yeast Rhodotorula frigidalcoholis and analysed its RNA after exposure to icy moon conditions. Our results show how the yeast can tolerate the extreme conditions and performs metabolic functions under the exposure conditions; for example, by halting the cell cycle in order to repair. Created in BioRender. Zaccaria (2026): https://BioRender.com/h5uzc5g. -- Environmental Microbiology via PubMed

Biogeochemical Cycles & Geobiology, Biophysics, Biosignatures & Paleobiology, Enceladus, Europa, Extremeophiles and Extreme Environments, Habitable Zones, Icy Worlds, Missions & Hardware, Status Report

Exploring The Habitability Of The Outer Solar System Icy Moons For The Extremotolerant Yeast Rhodotorula frigidalcoholis

by Keith CowingFebruary 26, 2026February 26, 2026

Psychrophilic and psychrotolerant microorganisms have the unique ability to grow below 0°C, which makes them ideal candidates for studying how life could survive on the icy moons of the solar […]

New research conducted by SwRI, Aix-Marseille University and the Institute for Advanced Studies demonstrated how complex organic molecules (COMs) could have formed in the protoplanetary disk represented here. Interstellar ultraviolet particles (orange arrows) irradiate the disk of materials, providing a range of conditions that could trigger the organic chemistry essential to COM creation as the icy grains migrate radially and vertically in the disk. A similar transport and irradiation process operates within Jupiter’s circumplanetary disk. -- SwRI

Astrochemistry, Astrogeology, Biochemistry & Organic Chemistry, Callisto, Europa, Ganymede, Habitable Zones, Icy Worlds, Io, Jupiter, Press Release

New Insights Into The Potential For Life In The Jovian System

by Keith CowingFebruary 23, 2026February 23, 2026

Southwest Research Institute was part of an international team that demonstrated how complex organic molecules (COMs), key chemical precursors to life, could have been incorporated into Jupiter’s Galilean moons during […]