Powerful auroras have been observed near the poles of Jupiter. These auroras are thought to be caused by the interaction of sulfur and oxygen ions in the outer regions of the Jovian magnetic field, some of which originates in Io's volcanoes, with particles flowing away from the Sun in the so-called solar wind.
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On February 28, 2007, the New Horizons spacecraft made its closest approach to Jupiter on its ultimate journey toward Pluto. Its unusual trajectory took New Horizons down Jupiter's so-called magnetotail, or magnetic tail, a region where no spacecraft has gone before.
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