Jupiter’s icy moon Europa has long intrigued scientists due to evidence suggesting it harbors a deep interior ocean. Recent research, however, reveals that accessing this ocean could be significantly more challenging than earlier models indicated.
Evidence of an Interior Ocean
Multiple lines of evidence, including Europa’s chaos terrain, induced magnetic fields, and surface plumes, support the conclusion that the moon contains a vast ocean beneath its icy crust. Additionally, there is strong evidence of hydrothermal activity at the core-mantle boundary, likely driven by tidal flexing. This raises the possibility that Europa’s ocean could support life.
Current Missions and Future Exploration
Two missions, the European Space Agency’s Jupiter Icy Moons Explorer (JUICE) and NASA’s Europa Clipper, are currently en route to Europa. These missions aim to investigate the moon’s surface and assess the potential for life within its ocean. If biosignatures are detected, follow-up missions like the Europa Lander and the Deeper Access, Deeper Understanding (DADU) submersible may be proposed.
New Findings on Accessing the Ocean
A study led by Rutgers University scientist Lujendra Ojha and his team, published in Nature Astronomy, examined how liquid water from Europa’s ocean could rise through cracks in the ice to form shallow reservoirs. The research utilized computer simulations to explore this process.
The findings suggest that the journey from the deep ocean to the surface is likely more complicated than previously thought. Earlier models assumed a relatively orderly movement of water through the ice, but Ojha’s simulations indicate that water would likely move turbulently through fractures, losing heat rapidly as it interacts with the ice walls. This turbulence could lead to the formation of ice crystals that clog the pathways.
Implications for Future Missions
Ojha noted, “This water that’s going to come up, it’s going to be turbulent… and when that happens, that liquid water is going to cool very, very fast as it approaches the surface.” The study concluded that if shallow reservoirs exist, they may not be directly connected to the ocean but could instead form from localized melting within the ice crust.
These findings imply that Europa’s ice shell may act as a stronger barrier between the ocean and the surface than previously assumed. As Ojha summarized, the research challenges the notion of how easily liquid water can rise to the surface without freezing. This understanding will be crucial for interpreting data from upcoming missions like JUICE and Europa Clipper, which are scheduled to arrive at Jupiter in July 2031 and April 2030, respectively.
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Original source: universetoday.com
