The Galileo spacecraft has found the most convincing evidence yet that Europa, one of Jupiter's moons, has oceans of liquid water beneath its icy crust. Margaret Kivelson and co-workers at the University of California at Los Angeles, US, have added strong support to earlier indications that subsurface water exists (2000 Science 289 1340). The presence of water near the surface of Europa, about the size of Earth's moon, would make it a prime candidate for the search for extraterrestrial life.
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