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Published online 21 October 2009 | Nature | doi:10.1038/news.2009.1033
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Probe uncovers Mercury's youthful secret
Latest fly-by reveals planet's recent volcanic activity.
A newly discovered crater on Mercury may have been geologically active as recently as a billion years ago. The discovery was made by NASA's Mercury Surface, Space Environment, Geochemistry and Ranging (MESSENGER) spacecraft on its latest fly-by of the innermost planet of the Solar System on 29 September.
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