Water line area maps expressed in units of µmˆ% of continuum. The four observation time windows are July 2011 at 67.09 µm, February 2012 at 66.44 and 67.09 µm, July-August 2012 at 66.44 and 67.09 µm, and January-February 2013 at 66.44 and 67.09 µm. Saturn’s 1-bar level is represented by the black ellipse, with the north pole facing upwards. A selection of iso-latitudes are plotted with grey lines. The rotation axis corresponds to the thin dashed black line. The beam spatial extent is illustrated by the circle in a dashed blue line. The black dots correspond to the central position of the spatial pixels. The position and extension of the beacon (see Table 3) at mid-observation time is represented with the thick dashed black lines. A cubic interpolation was applied to the data. -- astro-ph.EP

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Enceladus, Icy Worlds, Imaging & Spectroscopy, Saturn, Status Report

Temporal Evolution Of Water Abundance In Saturn’s Hot Vortex Of 2011-2013

by Keith CowingMay 8, 2025May 8, 2025

Water vapour is delivered to Saturn’s stratosphere by Enceladus’ plumes and subsequent diffusion in the planet system. It is expected to condense into a haze in the middle stratosphere.

The conceptual scheme outlines the primary prerequisites for habitability in ocean worlds, highlighting the importance of water, energy, CHNOPS, and TMs. The horizontal bar on the bottom denotes our assessment of the extent of exploration of each subject area indicated in the top bar. Ocean worlds are not to scale. The Europa image is modified from the NASA Photojournal PIA01295, credit NASA/JPL/University of Arizona. The Titan image is modified from the NASA Photojournal PIA20016, credit NASA/JPL/University of Arizona/University of Idaho. The Callisto image is modified from the NASA Photojournal PIA03456, credit NASA/JPL/German Aerospace Center (DLR). The Enceladus image is modified from the NASA Photojournal PIA06187, credit NASA/JPL/Space Science Institute. The Ganymede image is modified from the NASA Photojournal PIA01972, credit NASA/JPL. The Pluto image is modified from the NASA Photojournal PIA11709, credit NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute. The Triton image is modified from the NASA Photojournal PIA01994, credit NASA/JPL. -- The Planetary Science Journal

Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Enceladus, Europa, Habitable Zones, Icy Worlds, Nanotechnology & SynBio, Status Report, Water/Hycean Worlds & Oceanography

Plume Particle Ejecta Can Trace Habitat-forming Gradients in Ocean Worlds: Insights from Planet Earth Geochemistry

by Keith CowingMay 8, 2025May 8, 2025

Upcoming explorations for habitability in the ocean worlds of the solar system can greatly benefit from searching beyond parameters such as water, organics, nitrogen, phosphate, and silicate and being able […]

Schematic of topography on an icy satellite. Equations shown for the evolution of Newtonian viscous ice with shell thickness H. The parameters and equations shown on the figure are described in the text. -- astro-ph.EP

Astrogeology, Biogeochemical Cycles & Geobiology, Enceladus, Europa, Icy Worlds, Imaging & Spectroscopy, Mapping, Geodesy, Cartography, Bathymetry, Status Report, Water/Hycean Worlds & Oceanography

Implications Of Shallow-shell Models For Topographic Relaxation On Icy Satellites

by Keith CowingMay 2, 2025May 2, 2025

Icy satellites host topography at many length scales, from rifts and craters on the small end to equatorial-pole shell thickness differences that are comparable to these bodies’ circumference.

A miniature black smoker - The syringe injects the sulfidic fluid into the iron-rich solution in the vial. This precipitates a black iron-sulfide membrane. © Vanessa Helmbrecht

Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biophysics, Biosignatures & Paleobiology, Enceladus, Extremeophiles and Extreme Environments, Habitable Zones, Icy Worlds, Microbiology & Virology, Origin & Evolution of Life, Press Release, ROVs/Submersibles/Diving, Water/Hycean Worlds & Oceanography

Geobiology: Iron, Sulfur, Heat – And First Life

by Keith CowingMay 1, 2025May 1, 2025

The very first cells obtained their energy from geochemical reactions. LMU researchers have now managed to recreate this ancient metabolic process in their laboratory.

This artist's concept shows Orbilander in its landed configuration on Saturn's moon Enceladus. Image: Johns Hopkins University Applied Physics Laboratory

Biosignatures & Paleobiology, Enceladus, Habitable Zones, Icy Worlds, Imaging & Spectroscopy, Mapping, Geodesy, Cartography, Bathymetry, Missions & Hardware, Reports, Roadmaps, & Plans, Robotics/Rovers/UAVs, Saturn, Status Report, Water/Hycean Worlds & Oceanography

Enceladus Orbilander Flagship Mission

by Keith CowingApril 28, 2025April 28, 2025

The second-highest priority new Flagship mission in Origins, Worlds, and Life: A Decadal Strategy for Planetary Science and Astrobiology 2023-2032 is the Enceladus Orbilander [1].

Dramatic plumes, both large and small, spray water ice and vapor from many locations along the famed "tiger stripes" near the south pole of Saturn's moon Enceladus. The tiger stripes are four prominent, approximately 84-mile- (135-kilometer-) long fractures that cross the moon's south polar terrain. Larger image

Astrochemistry, Astrogeology, Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Ceres, Enceladus, Europa, Habitable Zones, Icy Worlds, Imaging & Spectroscopy, Status Report, Water/Hycean Worlds & Oceanography

Supercooling, Glass Formation, and Mineral Assemblages upon Freezing of Salty Ice Grains from Enceladus’s Ocean

by Keith CowingApril 21, 2025April 21, 2025

The analysis of micrometer-sized ice grains emitted into space by Saturn’s moon Enceladus suggests that the moon’s subsurface ocean may be habitable. However, the formation conditions of these ice grains […]

The Sun hangs low on the horizon above solidified pancake ice in the Arctic Ocean. (Photograph courtesy Andy Mahoney, NSIDC.)

Analog Studies, Biosignatures & Paleobiology, Enceladus, Europa, Habitable Zones, Icy Worlds, Status Report

Spectroscopic Protocol for Biosignature Detection: Arctic Ice Samples as Analogs for Icy Moons

by Keith CowingApril 20, 2025April 20, 2025

The moons of Jupiter and Saturn, such as Europa and Enceladus, are strong candidates for the search for life outside of Earth.

Schematic illustration of the interior of Enceladus. There is the ocean and rocky seafloor beneath the surface ice. The seawater is erupting from the surface through fractures. The presence of hydrothermal environments is suggested on the seafloor. Various materials, such as hydrogen and phosphate, would be dissolved from seafloor rocks. Metals essential for life would be insoluble from rocks and depleted for microbes. -- Japan Agency for Marine-Earth Science and Technology

Astrogeology, Atmospheres, Climate, Weather, Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Enceladus, Habitable Zones, Icy Worlds, Origin & Evolution of Life, Press Release, Water/Hycean Worlds & Oceanography

Are Metals Depleted For Life In The Ocean Of Enceladus?

by Keith CowingMarch 21, 2025March 21, 2025

Laboratory investigations for trace metals in ocean environments beyond Earth

Enceladus, Icy Worlds, Saturn, Status Report, Water/Hycean Worlds & Oceanography

Enceladus’s Limit Cycle

by Keith CowingMarch 10, 2025March 9, 2025

Enceladus exhibits some remarkable phenomena, including water geysers spraying through surface cracks, a global ice shell that is librating atop an ocean, a large luminosity, and rapid outward orbital migration.

Visualisation of the hypothesis for the observed stripe features, with a reflection grating located at the E ring. A zoomed-in view is shown in the bottom right corner. -- astro-ph.EP

Astrochemistry, Astrogeology, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Comets and Asteroids, Enceladus, Icy Worlds, Imaging & Spectroscopy, Missions & Hardware, Saturn, Status Report

Peculiar Rainbows in Saturn’s E Ring: Uncovering Luminious Bands Near Enceladus

by Keith CowingMarch 9, 2025June 9, 2025

We report observations of stripe-like features in Enceladus’ plumes captured simultaneously by Cassini’s VIMS-IR and ISS NAC instruments during flyby E17, with similar patterns seen in VIMS-IR data from flyby […]

Enceladus

Temporal Evolution Of Water Abundance In Saturn’s Hot Vortex Of 2011-2013

Plume Particle Ejecta Can Trace Habitat-forming Gradients in Ocean Worlds: Insights from Planet Earth Geochemistry

Implications Of Shallow-shell Models For Topographic Relaxation On Icy Satellites

Geobiology: Iron, Sulfur, Heat – And First Life

Enceladus Orbilander Flagship Mission

Supercooling, Glass Formation, and Mineral Assemblages upon Freezing of Salty Ice Grains from Enceladus’s Ocean

Spectroscopic Protocol for Biosignature Detection: Arctic Ice Samples as Analogs for Icy Moons

Are Metals Depleted For Life In The Ocean Of Enceladus?

Enceladus’s Limit Cycle

Peculiar Rainbows in Saturn’s E Ring: Uncovering Luminious Bands Near Enceladus

Mystery Surrounding The Formation Of Asteroid Bennu Solved

Scientists Uncover Gravity’s Impact On The Human Genome

Discovery Of Radio Emission From The Exoplanet β Pictoris b

Could Earth’s Magnetic Field Influence How Earth Life Ages?

Is A Nearby Advanced Alien Civilization Out There Waiting To Pounce On Earth? Unlikely, Says New Study

From Gaia to GaiaNIR: Science from Precision Astrometry Across the Universe and Beyond the Extinction Barrier

First Landing Site Workshop: SkyFall Mission To Mars

Lunar and Planetary Science Conference (LPSC) 2027

The Galactic Journey of the Solar System: Astronomical, Geological, and Paleo-Climatological Perspectives

European Astronomical Society Annual Meeting 2027