Jupiter's moon Callisto is very likely an ocean world

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Old NASA mission reveals an unlikely world harbors an ocean

Scientists using old flyby data from NASA's Galileo mission have found stronger evidence that Jupiter's moon Callisto has an ocean.

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Jupiter's moon Callisto is very likely an ocean world

More pocked with craters than any other object in our solar system, Jupiter's outermost and second-biggest Galilean moon, Callisto, appears geologically unremarkable. In the 1990s, however, NASA's Galileo spacecraft captured magnetic measurements near Callisto that suggested that its ice shell surface—much like that of Europa, another moon of Jupiter—may encase a salty, liquid water ocean.

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Think of a cratered surface. The most bombarded in the Solar System. Now imagine that beneath that scarred armor lies a vast ocean of salt water: that’s Callisto, the moon of Jupiter that is about to rewrite our understanding of ocean worlds. Yep. Because despite being the most cratered surface in our planetary system, Callisto has kept a secret for decades. In the 1990s, NASA’s Galileo spacecraft captured magnetic measurements that suggested so…

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Jupiter’s Moon Callisto Is Very Likely an Ocean World

Source: AGU Advances More pocked with craters than any other object in our solar system, Jupiter’s outermost and second-biggest Galilean moon, Callisto, appears geologically unremarkable. In the 1990s, however, NASA’s Galileo spacecraft captured magnetic measurements near Callisto that suggested that its ice shell surface—much like that of Europa, another moon of Jupiter—may encase a salty, liquid water ocean. But evidence for Callisto’s subsurf…