Hubble observations suggest underground ocean on Jupiter's largest moon Ganymede

NASA’s Hubble Space Telescope observed aurorae on the moon generated by Ganymede’s magnetic fields. Credit: NASA/ESA NASA’s Hubble Space Telescope has the best evidence yet for an underground saltwater ocean on Ganymede, Jupiter’s largest moon. Ganymede is the largest moon in our solar system and the only moon with its own magnetic field. When Jupiter’s magnetic field changes, the aurorae on Ganymede also change, rocking back and forth. Because aurorae are controlled by the magnetic field, if you observe the aurorae in an appropriate way, you learn something about the magnetic field.

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