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Galileo mission

  • Artist's concept of aurorae and Ganymede (Image: NASA, ESA, and G. Bacon (STScI))
    Space
    Aurorae indicate subterranean ocean on Ganymede
    An ultraviolet light show is the best evidence that Ganymede has a gigantic ocean beneath its icy surface. Images captured by the Hubble Space Telescope of the aurorae in the moon's tenuous atmosphere provide what NASA calls the best evidence yet for a wet Ganymede where life could exist.