For hundreds of years, scientists have wondered how planets and stars generate magnetic fields. On Earth, we can’t see the dynamo that’s generating our magnetic field because it’s buried deep in a rocky, iron-laden crust. But that’s not a problem with a gas giant. Jupiter’s magnetic field is turning out to be a lot more complicated than expected, with lots of small-scale structures embedded. According to Connerney, these variations may mean Juno is getting close to the dynamo, and that Jupiter’s dynamo is very close to the surface. By piecing together data from one orbit at a time, Juno may provide the first clear map of what a dynamo looks like.