Aurora shift confirms Ganymede’s ocean
Jupiter moon’s underground saltwater explains Hubble telescope observations
![Ganymede](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/03/cc_Ganymede_feat_free.jpg?fit=860%2C460&ssl=1)
SEA SIGNS Shifts in Ganymede’s version of the Northern Lights, illustrated here, suggest that a saltwater ocean lurks beneath the icy crust of Jupiter’s largest moon.
NASA, ESA