New research indicates that salty, nutrient-rich ice on Europa could sink through the moon's icy shell to feed its hidden ocean, potentially supporting life. Geophysicists at Washington State University used computer simulations to show this process, inspired by Earth's crustal delamination. The findings address a key habitability challenge for the Jupiter moon.
Europa, one of Jupiter's largest moons, harbors more liquid water than all of Earth's oceans combined, yet this vast subsurface ocean lies beneath a thick icy shell that blocks sunlight. For years, scientists have puzzled over how nutrients from the surface could reach this isolated environment, essential for any potential microbial life.
A study published in The Planetary Science Journal proposes a solution: dense, salt-laden ice from Europa's surface can detach and sink through the shell. Researchers Austin Green and Catherine Cooper drew inspiration from Earth's crustal delamination, where dense crustal sections sink into the mantle. Their computer models demonstrate that impurities like salts increase ice density and weaken its structure, allowing nutrient-rich patches to break free and descend.
"This is a novel idea in planetary science, inspired by a well-understood idea in Earth science," said Austin Green, lead author and now a postdoctoral researcher at Virginia Tech. "Most excitingly, this new idea addresses one of the longstanding habitability problems on Europa and is a good sign for the prospects of extraterrestrial life in its ocean."
The simulations indicate the process works across a range of salt concentrations, provided the surface ice undergoes modest weakening. It occurs relatively quickly on geological timescales and can repeat, offering a steady nutrient supply. Europa's surface, bombarded by Jupiter's radiation, produces compounds from salts that could nourish microbes, but prior models showed limited vertical exchange due to mostly lateral geological activity.
This research aligns with NASA's Europa Clipper mission, launched in 2024, which aims to investigate the moon's ice shell, ocean, and habitability using onboard instruments. The work was partly funded by NASA Grant NNX15AH91G and utilized computing resources at Washington State University.
The journal reference is: A. P. Green, C. M. Cooper. Dripping to Destruction: Exploring Salt-driven Viscous Surface Convergence in Europa’s Icy Shell. The Planetary Science Journal, 2026; 7 (1): 13. DOI: 10.3847/PSJ/ae2b6f.
