…run deep


EUROPA’S sibling Callisto may also boast an underground ocean, scientists say. Margaret Kivelson of the University of California at Los Angeles says data gathered by the Galileo spacecraft indicate that Jupiter’s moon Callisto does not generate its own magnetism. Instead, the field detected is an echo of Jupiter’s stronger field sweeping through the moon’s interior. This induced field could only exist if Callisto contains an electrically conducting layer, Kivelson said at last week’s Boston meeting of the American Geophysical Union. An ocean 10 kilometres deep with the same conductivity as seawater fits the bill surprisingly well. Although Callisto’s frozen terrain lacks any sign of water,
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