All articles tagged with #europa
A new analysis questions earlier interpretations of Europa’s water plumes, suggesting signals previously attributed to plume activity may be misread or require alternative explanations, underscoring the need for fresh observations to confirm whether Europa hosts liquid water and potential habitability.
In 2003 NASA deliberately crashed the Galileo spacecraft into Jupiter to prevent a potential contaminant from a drifting probe reaching Europa, after data suggested a subsurface salty ocean on Europa (and discoveries about other Jovian moons). The decision reflected planetary-protection rules: if a world could harbor life, a failing or abandoned spacecraft must not risk introducing Earth biology. Galileo’s extended mission delivered key findings about Europa, Ganymede, and Callisto, and its disposal set a precedent for how future outer-planet missions are planned to avoid contaminating ocean worlds like Europa.
A 14-year reanalysis of Hubble data casts doubt on Europa’s previously claimed water vapor plumes, lowering confidence from about 99.9% to under 90% and suggesting the earlier detections may have been due to data placement noise; the team says plumes can’t be ruled out, but the question may be settled by NASA’s Europa Clipper mission expected to arrive in 2030.
A new reanalysis of Hubble data reduces the 2014 claim of 200-km-high water-vapor plumes on Europa from 99.9% confidence to under 90%, suggesting the earlier signal may be statistical noise; meanwhile there’s evidence for a persistent hydrogen exosphere but no localized water vapor. Future missions like Europa Clipper and JUICE will help settle the question.
A fresh reanalysis of 14 years of Hubble data weakens the case for intermittent water vapor plumes on Jupiter’s moon Europa, reducing certainty from 99.9% to below 90% and leaving open the possibility that plumes exist but not yet definitively confirmed; future missions like Europa Clipper are expected to settle the question.
New vacuum-chamber experiments modeling Europa- and Enceladus-like conditions find that low-pressure cryogenic freezing can produce highly porous, croissant-shaped 'fluffy ice' layers. These layers could be several meters to tens of meters thick, creating brittle ice that threatens lander stability or burial on the surface, complicating future missions to ocean worlds. Researchers will simulate flowing cryovolcanic flows to better mimic real surfaces, and mission planners (Europa Clipper, JUICE, and future landers) will need to rethink landing gear and procedures to cope with this icy hazard.
A computer-modeling study indicates Europa’s global ocean may lack the energy needed to support life because its rocky interior is largely quiet and tidal heating is weak. Energy would be scarce for potential ecosystems, confined to shallow rocky zones or radiolysis-driven chemistry, making life less likely overall. The findings help guide the Europa Clipper mission’s search strategies, but confirmation would require direct samples from the ocean.
A new look at Galileo data detected faint ammonia near Europa’s fractures, implying a subsurface ocean or ammonia-laden shallow layers and boosting the case for habitability; the upcoming Europa Clipper mission will continue to search for chemical signs of life.
A 2022 Juno flyby analysis estimates Europa’s ice shell in the observed region to be about 29 kilometers (18 miles) thick on average. If a warmer, convective inner layer exists, the total thickness could be greater; the presence of dissolved salt could reduce thickness by roughly 4.8 kilometers. Near-surface “scatterers” (cracks/pores) are likely small and not major pathways for exchange with the ocean. These findings help constrain how the subsurface ocean might connect to the surface and inform upcoming Europa Clipper and Juice missions in assessing the moon’s habitability.
NASA’s Juno used its Microwave Radiometer to measure Europa’s near-surface ice shell during a 2022 flyby, finding an average thickness of about 29 km (18 miles) in the observed region and favoring thicker-shell models; if a salty layer exists, thickness could be reduced by about 3 miles. The data also reveal small near-surface scatterers—cracks and pores—not likely to provide major nutrient pathways to the subsurface ocean, with implications for future Europa Clipper and Juice missions.
Washington State University researchers model lithospheric foundering on Jupiter’s moon Europa, showing that salt-rich surface ice can sink through the ice shell and transport oxidants formed by Jupiter’s radiation into the subsurface ocean in as little as 30,000 years, potentially delivering the ingredients needed for life and informing upcoming Europa Clipper investigations.
A new study suggests that Europa's ocean floor likely lacks significant tectonic activity and hydrothermal vents, reducing its chances for supporting life, though other energy sources might still exist. The findings imply that Europa may be less hospitable for life than previously thought, but the search continues with upcoming missions like NASA's Europa Clipper.
A recent study suggests that the search for life on Europa, a moon of Jupiter with a subsurface ocean, may be futile due to lack of sufficient internal heat and tectonic activity, casting doubt on the presence of habitable conditions despite upcoming missions like NASA's Europa Clipper and ESA's Juice.
Scientists propose that radioactive elements seeping from Europa's rocks into its subsurface ocean could generate enough energy to support microbial life, offering an alternative to internal heat as a source of habitability. The upcoming NASA Europa Clipper mission may test this theory, which is inspired by Earth's chemosynthetic ecosystems.
Scientists have proposed that the mysterious spider-like feature observed on Europa's surface, initially thought to be a structure within a crater, may have formed through processes similar to Earth's lake stars, but likely resulted from an asteroid impact that created cracks allowing salty water to seep through, providing insights into Europa's subsurface and potential signs of extraterrestrial life.