How Scientists Used Auroras To Confirm Ganymede's 60-Mile Deep Ocean

March 14, 2015 2:19 PM

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An image of Ganymede's auroras is captured by the Hubble Space Telescope. How much the auroras moved when the moon's magnetic field shifted clued researchers in on the presence of an ocean underneath the frozen crust.(Photo : NASA/ESA)

An image of Ganymede's auroras is captured by the Hubble Space Telescope. How much the auroras moved when the moon's magnetic field shifted clued researchers in on the presence of an ocean underneath the frozen crust.

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