Dramatic Flyby Confirms That Mercury's Radioactive Aurora Touches the Ground | Discover ...

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Earth's beautiful, neon-colored aurorae occur when charged particles from the sun (the solar wind) collide with the planet's outer atmosphere, called the ionosphere.

New research released by the Europlanet Society details the cause behind an even stranger aurora, the one that regularly wreathes Mercury with X-rays. This aurora arises from the planet's surface, not its upper atmosphere, for reasons described in a new paper .

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Publisher: Discover Magazine
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