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2015-03-14 16:51:18

In this artist’s concept, the moon Ganymede orbits the giant planet Jupiter. NASA’s Hubble Space Telescope observed aurorae on the moon controlled by Ganymede’s magnetic fields. This field is embedded in Jupiter’s own immense magnetosphere (yellow field lines). A saline ocean under the moon’s icy crust reduces shifting in the auroral belts as measured by Hubble

Image uploaded by Stephen Morgan
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