North pole postcard: Io

North pole postcard: Io
North pole postcard: Io Jupiter's moon Io is the most volcanically active world in the solar system. When New Horizons flew past in 2007, its volcano Tvashtar was erupting violently, spewing ash and vapor high above Io's north pole. Here, New Horizons looked back to see the glow of Tvashtar's effusive eruptions lighting up the nighttime polar surface. NASA / JHUAPL / SwRI / Emily Lakdawalla

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