Jupiter's Moon Europa: Beware 'Fluffy Ice' Hazards

Researchers have identified a surprising hazard for missions targeting icy moons like Jupiter's Europa and Saturn's Enceladus: "fluffy" ice. These moons are of great interest due to suspected subsurface liquid water oceans, driving significant research efforts by space agencies.

A recent study simulated the low-pressure freezing conditions found on these moons. The experiments revealed that water freezes into highly porous, brittle ice sheets, with thicknesses varying significantly between Europa and Enceladus. This "croissant-like" ice is fragile.

This discovery presents a serious challenge for future lander missions. The porous and fragile ice layers, potentially several meters thick, could cause landers to collapse or sink upon arrival, jeopardizing years of travel and expensive equipment.

These findings underscore the need for engineers to re-evaluate landing mechanisms and consider the unique terrain of these outer solar system moons. Space agencies like NASA and ESA are planning future missions, including JUICE and Europa Clipper, set to arrive in the coming years.