The hidden ocean of Europa may be harder to reach than imagined
In short: NASA's most expensive mission is heading to Jupiter's moon Europa to hunt for life. While scientists long hoped for easy access to its deep ocean via surface cracks, new simulations suggest that the water might be trapped far below, making our search for extraterrestrial life significantly more complex.
In 1979, the Voyager-2 probe provided the first high-quality images of Europa from 118,000 miles away, leading scientists to hypothesize a liquid ocean beneath its ice. This was later confirmed by the Galileo space probe in the late 1990s, which determined the moon's ice shell is between 6 and 18 miles thick. These findings established Europa as a primary target in the search for habitable environments beyond Earth.
To investigate these conditions, NASA launched the Europa Clipper on October 14, 2024. This spacecraft, the largest ever designed to study a planetary body, will travel 1.8 billion miles to reach Jupiter by April 2030. Once there, it will perform 49 close flybys of Europa, using nine simultaneous science instruments to analyze the moon's surface and subsurface chemistry.
However, a recent study led by Rutgers scientist Lujendra Ojha complicates the mission's goals. Scientists previously hoped that deep ocean water might rise through cracks to form shallow reservoirs that spacecraft could easily sample. Recent Nature Astronomy models indicate this is improbable; as agitated water ascends via fissures, it quickly cools, creates ice particles, and obstructs the gaps in mere hours. This means that if future probes detect shallow liquid pockets, they might not be connected to the deep ocean. Instead, those pockets could be isolated areas where the ice shell melted locally. This distinction is critical because the deep ocean—not the surface—is the most scientifically compelling environment due to its unique combination of water, chemistry, and energy.
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Sources
- Summary by Intellect · source: Is There Life on Jupiter's Moon? NASA Sends Probe to Search for Life on Europa
- Also: Europa Clipper - NASA Science
- Also: The search for life on Jupiter's icy moon Europa just got more complicated
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