Io’s long-debated magma ocean may not exist. Juno spacecraft data reveals that tidal forces deform the moon differently than expected if a magma ocean were present. Instead, Io’s mantle appears mostly ...

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The discovery solves a 44-year-old mystery of why, and how, Jupiter's ... of this flexing, Io's interior might be home to a large magma ocean, stretching beneath its entire surface like a layer ...